[Silverlight] 컨트롤에 Validation Tooltip 적용하기

2010. 5. 22. 06:59WEB/Silverlight

기본적으로 DataGrid, DatePicker의 경우 ValidationTooltip이 적용되어 있지 않습니다. ValidationTooltip이 해당 컨트롤에 적용되어 있지 않으면 에러가 발생해도 에러가 표현되지 않습니다. 그런 경우에, 어떤 컨트롤이든 간에 여기서 소개하는 것과 같이 ControlTemplate을 조정하면 에러를 표현할 수 있습니다.

  1. 먼저 MSDN에서 해당 컨트롤의 기본 Template를 찾아, 사용하고 계시는 Style.xaml파일에 붙여넣습니다.
  2. Validation Error를 나타내는 Validation Tooltip의 ControlTemplate를 Style.xaml에 붙여넣습니다.
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    <ControlTemplate x:Key="ValidationToolTipTemplate">
        <Grid x:Name="Root" Margin="5,0" RenderTransformOrigin="0,0" Opacity="0">
            <Grid.RenderTransform>
                <TranslateTransform x:Name="xform" X="-25"/>
            </Grid.RenderTransform>
            <vsm:VisualStateManager.VisualStateGroups>
                <vsm:VisualStateGroup Name="OpenStates">
                    <vsm:VisualStateGroup.Transitions>
                        <vsm:VisualTransition GeneratedDuration="0"/>
                        <vsm:VisualTransition To="Open" GeneratedDuration="0:0:0.2">
                            <Storyboard>
                                <DoubleAnimation Storyboard.TargetName="xform" Storyboard.TargetProperty="X" To="0" Duration="0:0:0.2">
                                    <DoubleAnimation.EasingFunction>
                                        <BackEase Amplitude=".3" EasingMode="EaseOut"/>
                                    </DoubleAnimation.EasingFunction>
                                </DoubleAnimation>
                                <DoubleAnimation Storyboard.TargetName="Root" Storyboard.TargetProperty="Opacity" To="1" Duration="0:0:0.2"/>
                            </Storyboard>
                        </vsm:VisualTransition>
                    </vsm:VisualStateGroup.Transitions>
                    <vsm:VisualState x:Name="Closed">
                        <Storyboard>
                            <DoubleAnimation Storyboard.TargetName="Root" Storyboard.TargetProperty="Opacity" To="0" Duration="0"/>
                        </Storyboard>
                    </vsm:VisualState>
                    <vsm:VisualState x:Name="Open">
                        <Storyboard>
                            <DoubleAnimation Storyboard.TargetName="xform" Storyboard.TargetProperty="X" To="0" Duration="0"/>
                            <DoubleAnimation Storyboard.TargetName="Root" Storyboard.TargetProperty="Opacity" To="1" Duration="0"/>
                        </Storyboard>
                    </vsm:VisualState>
                </vsm:VisualStateGroup>
            </vsm:VisualStateManager.VisualStateGroups>
     
            <Border Margin="4,4,-4,-4" Background="#052A2E31" CornerRadius="5"/>
            <Border Margin="3,3,-3,-3" Background="#152A2E31" CornerRadius="4"/>
            <Border Margin="2,2,-2,-2" Background="#252A2E31" CornerRadius="3"/>
            <Border Margin="1,1,-1,-1" Background="#352A2E31" CornerRadius="2"/>
     
            <Border Background="#FFDC000C" CornerRadius="2"/>
            <Border CornerRadius="2">
                <TextBlock UseLayoutRounding="false" Foreground="White" Margin="8,4,8,4" MaxWidth="250" TextWrapping="Wrap" Text="{Binding (Validation.Errors)[0].ErrorContent}"/>
            </Border>
        </Grid>
    </ControlTemplate>
  3. Control이 Error상태임을 표현하기 위한 VisualStateGroup을 추가해야합니다. VisualStateManager.VisualStateGroups을 찾아 하위 요소로 다음 코드를 추가합니다.
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    <VisualStateGroup x:Name="ValidationStates">
        <VisualState x:Name="Valid"/>
        <VisualState x:Name="InvalidUnfocused">
            <Storyboard>
                <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ValidationErrorElement" Storyboard.TargetProperty="Visibility">
                    <DiscreteObjectKeyFrame KeyTime="0">
                        <DiscreteObjectKeyFrame.Value>
                            <Visibility>Visible</Visibility>
                        </DiscreteObjectKeyFrame.Value>
                    </DiscreteObjectKeyFrame>
                </ObjectAnimationUsingKeyFrames>
            </Storyboard>
        </VisualState>
        <VisualState x:Name="InvalidFocused">
            <Storyboard>
                <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ValidationErrorElement" Storyboard.TargetProperty="Visibility">
                    <DiscreteObjectKeyFrame KeyTime="0">
                        <DiscreteObjectKeyFrame.Value>
                            <Visibility>Visible</Visibility>
                        </DiscreteObjectKeyFrame.Value>
                    </DiscreteObjectKeyFrame>
                </ObjectAnimationUsingKeyFrames>
                <ObjectAnimationUsingKeyFrames Storyboard.TargetName="validationTooltip" Storyboard.TargetProperty="IsOpen">
                    <DiscreteObjectKeyFrame KeyTime="0">
                        <DiscreteObjectKeyFrame.Value>
                            <System:Boolean>True</System:Boolean>
                        </DiscreteObjectKeyFrame.Value>
                    </DiscreteObjectKeyFrame>
                </ObjectAnimationUsingKeyFrames>
            </Storyboard>
        </VisualState>
    </VisualStateGroup>
  4. 이제 마지막으로 Validation Tooltip을 ControlTemplate의 Root Element의 하위 요소로 넣으시면 됩니다.
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    <Border x:Name="ValidationErrorElement" Visibility="Collapsed" BorderBrush="#FFDB000C" BorderThickness="1" CornerRadius="1">
        <ToolTipService.ToolTip>
            <ToolTip x:Name="validationTooltip" DataContext="{Binding RelativeSource={RelativeSource TemplatedParent}}" Template="{StaticResource ValidationToolTipTemplate}" Placement="Right" PlacementTarget="{Binding RelativeSource={RelativeSource TemplatedParent}}">
                <ToolTip.Triggers>
                    <EventTrigger RoutedEvent="Canvas.Loaded">
                        <BeginStoryboard>
                            <Storyboard>
                                <ObjectAnimationUsingKeyFrames Storyboard.TargetName="validationTooltip" Storyboard.TargetProperty="IsHitTestVisible">
                                    <DiscreteObjectKeyFrame KeyTime="0">
                                        <DiscreteObjectKeyFrame.Value>
                                            <System:Boolean>True</System:Boolean>
                                        </DiscreteObjectKeyFrame.Value>
                                    </DiscreteObjectKeyFrame>
                                </ObjectAnimationUsingKeyFrames>
                            </Storyboard>
                        </BeginStoryboard>
                    </EventTrigger>
                </ToolTip.Triggers>
            </ToolTip>
        </ToolTipService.ToolTip>
        <Grid Height="12" HorizontalAlignment="Right" Margin="1,-4,-4,0" VerticalAlignment="Top" Width="12" Background="Transparent">
            <Path Fill="#FFDC000C" Margin="1,3,0,0" Data="M 1,0 L6,0 A 2,2 90 0 1 8,2 L8,7 z"/>
            <Path Fill="#ffffff" Margin="1,3,0,0" Data="M 0,0 L2,0 L 8,6 L8,8"/>
        </Grid>
    </Border>
  5. 완성된 전체 코드는 다음과 같습니다. 저는 DatePicker, DataGrid에 적용하였으며 모두 성공하였습니다. 여기에는 DatePicker의 Style만 소개해드리겠습니다.
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    <Style x:Key="dpDefault" TargetType="controls:DatePicker">
        <Setter Property="IsTabStop" Value="False"/>
        <Setter Property="Background" Value="#FFFFFFFF"/>
        <Setter Property="Padding" Value="2"/>
        <Setter Property="SelectionBackground" Value="#FF444444"/>
        <Setter Property="BorderBrush">
            <Setter.Value>
                <LinearGradientBrush EndPoint=".5,0" StartPoint=".5,1">
                    <GradientStop Color="#FF617584" Offset="0"/>
                    <GradientStop Color="#FF718597" Offset="0.375"/>
                    <GradientStop Color="#FF8399A9" Offset="0.375"/>
                    <GradientStop Color="#FFA3AEB9" Offset="1"/>
                </LinearGradientBrush>
            </Setter.Value>
        </Setter>
        <Setter Property="BorderThickness" Value="1"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="controls:DatePicker">
                    <Grid x:Name="Root">
                        <Grid.Resources>
                            <SolidColorBrush x:Key="DisabledBrush" Color="#8CFFFFFF"/>
                            <ControlTemplate x:Key="DropDownButtonTemplate" TargetType="Button">
                                <Grid>
                                    <VisualStateManager.VisualStateGroups>
                                        <VisualStateGroup x:Name="CommonStates">
                                            <VisualStateGroup.Transitions>
                                                <VisualTransition GeneratedDuration="0"/>
                                                <VisualTransition GeneratedDuration="0:0:0.1" To="MouseOver"/>
                                                <VisualTransition GeneratedDuration="0:0:0.1" To="Pressed"/>
                                            </VisualStateGroup.Transitions>
                                            <VisualState x:Name="Normal"/>
                                            <VisualState x:Name="MouseOver">
                                                <Storyboard>
                                                    <ColorAnimation Duration="0" Storyboard.TargetName="Background" Storyboard.TargetProperty="(Border.Background).(SolidColorBrush.Color)" To="#FF448DCA"/>
                                                    <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[3].(GradientStop.Color)">
                                                        <SplineColorKeyFrame KeyTime="0" Value="#7FFFFFFF"/>
                                                    </ColorAnimationUsingKeyFrames>
                                                    <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[2].(GradientStop.Color)">
                                                        <SplineColorKeyFrame KeyTime="0" Value="#CCFFFFFF"/>
                                                    </ColorAnimationUsingKeyFrames>
                                                    <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[1].(GradientStop.Color)">
                                                        <SplineColorKeyFrame KeyTime="0" Value="#F2FFFFFF"/>
                                                    </ColorAnimationUsingKeyFrames>
                                                </Storyboard>
                                            </VisualState>
                                            <VisualState x:Name="Pressed">
                                                <Storyboard>
                                                    <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="Background" Storyboard.TargetProperty="(Border.Background).(SolidColorBrush.Color)">
                                                        <SplineColorKeyFrame KeyTime="0" Value="#FF448DCA"/>
                                                    </ColorAnimationUsingKeyFrames>
                                                    <DoubleAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="Highlight" Storyboard.TargetProperty="(UIElement.Opacity)">
                                                        <SplineDoubleKeyFrame KeyTime="0" Value="1"/>
                                                    </DoubleAnimationUsingKeyFrames>
                                                    <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[1].(GradientStop.Color)">
                                                        <SplineColorKeyFrame KeyTime="0" Value="#EAFFFFFF"/>
                                                    </ColorAnimationUsingKeyFrames>
                                                    <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[2].(GradientStop.Color)">
                                                        <SplineColorKeyFrame KeyTime="0" Value="#C6FFFFFF"/>
                                                    </ColorAnimationUsingKeyFrames>
                                                    <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[3].(GradientStop.Color)">
                                                        <SplineColorKeyFrame KeyTime="0" Value="#6BFFFFFF"/>
                                                    </ColorAnimationUsingKeyFrames>
                                                    <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[0].(GradientStop.Color)">
                                                        <SplineColorKeyFrame KeyTime="0" Value="#F4FFFFFF"/>
                                                    </ColorAnimationUsingKeyFrames>
                                                </Storyboard>
                                            </VisualState>
                                            <VisualState x:Name="Disabled">
                                                <Storyboard>
                                                    <DoubleAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="DisabledVisual" Storyboard.TargetProperty="(UIElement.Opacity)">
                                                        <SplineDoubleKeyFrame KeyTime="0" Value="1"/>
                                                    </DoubleAnimationUsingKeyFrames>
                                                </Storyboard>
                                            </VisualState>
                                        </VisualStateGroup>
                                    </VisualStateManager.VisualStateGroups>
                                    <Grid Height="18" HorizontalAlignment="Center" Margin="0" VerticalAlignment="Center" Width="19" Background="#11FFFFFF">
                                        <Grid.RowDefinitions>
                                            <RowDefinition Height="23*"/>
                                            <RowDefinition Height="19*"/>
                                            <RowDefinition Height="19*"/>
                                            <RowDefinition Height="19*"/>
                                        </Grid.RowDefinitions>
                                        <Grid.ColumnDefinitions>
                                            <ColumnDefinition Width="20*"/>
                                            <ColumnDefinition Width="20*"/>
                                            <ColumnDefinition Width="20*"/>
                                            <ColumnDefinition Width="20*"/>
                                        </Grid.ColumnDefinitions>
                                        <Border x:Name="Highlight" Margin="-1" Opacity="0" Grid.ColumnSpan="4" Grid.Row="0" Grid.RowSpan="4" BorderBrush="#FF6DBDD1" BorderThickness="1" CornerRadius="0,0,1,1"/>
                                        <Border x:Name="Background" Margin="0,-1,0,0" Opacity="1" Grid.ColumnSpan="4" Grid.Row="1" Grid.RowSpan="3" Background="#FF1F3B53" BorderBrush="#FFFFFFFF" BorderThickness="1" CornerRadius=".5"/>
                                        <Border x:Name="BackgroundGradient" Margin="0,-1,0,0" Opacity="1" Grid.ColumnSpan="4" Grid.Row="1" Grid.RowSpan="3" BorderBrush="#BF000000" BorderThickness="1" CornerRadius=".5">
                                            <Border.Background>
                                                <LinearGradientBrush EndPoint=".7,1" StartPoint=".7,0">
                                                    <GradientStop Color="#FFFFFFFF" Offset="0"/>
                                                    <GradientStop Color="#F9FFFFFF" Offset="0.375"/>
                                                    <GradientStop Color="#E5FFFFFF" Offset="0.625"/>
                                                    <GradientStop Color="#C6FFFFFF" Offset="1"/>
                                                </LinearGradientBrush>
                                            </Border.Background>
                                        </Border>
                                        <Rectangle StrokeThickness="1" Grid.ColumnSpan="4" Grid.RowSpan="1">
                                            <Rectangle.Stroke>
                                                <LinearGradientBrush EndPoint="0.48,-1" StartPoint="0.48,1.25">
                                                    <GradientStop Color="#FF494949"/>
                                                    <GradientStop Color="#FF9F9F9F" Offset="1"/>
                                                </LinearGradientBrush>
                                            </Rectangle.Stroke>
                                            <Rectangle.Fill>
                                                <LinearGradientBrush EndPoint="0.3,-1.1" StartPoint="0.46,1.6">
                                                    <GradientStop Color="#FF4084BD"/>
                                                    <GradientStop Color="#FFAFCFEA" Offset="1"/>
                                                </LinearGradientBrush>
                                            </Rectangle.Fill>
                                        </Rectangle>
                                        <Path Fill="#FF2F2F2F" Stretch="Fill" HorizontalAlignment="Center" Margin="4,3,4,3" VerticalAlignment="Center" RenderTransformOrigin="0.5,0.5" Grid.Column="0" Grid.ColumnSpan="4" Grid.Row="1" Grid.RowSpan="3" Data="M11.426758,8.4305077 L11.749023,8.4305077 L11.749023,16.331387 L10.674805,16.331387 L10.674805,10.299648 L9.0742188,11.298672 L9.0742188,10.294277 C9.4788408,10.090176 9.9094238,9.8090878 10.365967,9.4510155 C10.82251,9.0929432 11.176106,8.7527733 11.426758,8.4305077 z M14.65086,8.4305077 L18.566387,8.4305077 L18.566387,9.3435936 L15.671368,9.3435936 L15.671368,11.255703 C15.936341,11.058764 16.27293,10.960293 16.681133,10.960293 C17.411602,10.960293 17.969301,11.178717 18.354229,11.615566 C18.739157,12.052416 18.931622,12.673672 18.931622,13.479336 C18.931622,15.452317 18.052553,16.438808 16.294415,16.438808 C15.560365,16.438808 14.951641,16.234707 14.468243,15.826504 L14.881817,14.929531 C15.368796,15.326992 15.837872,15.525723 16.289043,15.525723 C17.298809,15.525723 17.803692,14.895514 17.803692,13.635098 C17.803692,12.460618 17.305971,11.873379 16.310528,11.873379 C15.83071,11.873379 15.399232,12.079271 15.016094,12.491055 L14.65086,12.238613 z"/>
                                        <Ellipse Fill="#FFFFFFFF" StrokeThickness="0" Height="3" HorizontalAlignment="Center" VerticalAlignment="Center" Width="3" Grid.ColumnSpan="4"/>
                                        <Border x:Name="DisabledVisual" Opacity="0" Grid.ColumnSpan="4" Grid.Row="0" Grid.RowSpan="4" BorderBrush="#B2FFFFFF" BorderThickness="1" CornerRadius="0,0,.5,.5"/>
                                    </Grid>
                                </Grid>
                            </ControlTemplate>
                        </Grid.Resources>
                        <VisualStateManager.VisualStateGroups>
                            <VisualStateGroup x:Name="CommonStates">
                                <VisualState x:Name="Normal"/>
                                <VisualState x:Name="Disabled">
                                    <Storyboard>
                                        <DoubleAnimation Duration="0" Storyboard.TargetName="DisabledVisual" Storyboard.TargetProperty="Opacity" To="1"/>
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                            <VisualStateGroup x:Name="ValidationStates">
                                <VisualState x:Name="Valid"/>
                                <VisualState x:Name="InvalidUnfocused">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ValidationErrorElement" Storyboard.TargetProperty="Visibility">
                                            <DiscreteObjectKeyFrame KeyTime="0">
                                                <DiscreteObjectKeyFrame.Value>
                                                    <Visibility>Visible</Visibility>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="InvalidFocused">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ValidationErrorElement" Storyboard.TargetProperty="Visibility">
                                            <DiscreteObjectKeyFrame KeyTime="0">
                                                <DiscreteObjectKeyFrame.Value>
                                                    <Visibility>Visible</Visibility>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="validationTooltip" Storyboard.TargetProperty="IsOpen">
                                            <DiscreteObjectKeyFrame KeyTime="0">
                                                <DiscreteObjectKeyFrame.Value>
                                                    <System:Boolean>True</System:Boolean>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                        </VisualStateManager.VisualStateGroups>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="*"/>
                            <ColumnDefinition Width="Auto"/>
                        </Grid.ColumnDefinitions>
                        <controlsPrimitives:DatePickerTextBox x:Name="TextBox" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}" Grid.Column="0" SelectionBackground="{TemplateBinding SelectionBackground}"/>
                        <Button x:Name="Button" Margin="2,0,2,0" Width="20" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Foreground="{TemplateBinding Foreground}" Template="{StaticResource DropDownButtonTemplate}" Grid.Column="1"/>
                        <Grid x:Name="DisabledVisual" IsHitTestVisible="False" Opacity="0" Grid.ColumnSpan="2">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="*"/>
                                <ColumnDefinition Width="Auto"/>
                            </Grid.ColumnDefinitions>
                            <Rectangle Fill="#8CFFFFFF" RadiusX="1" RadiusY="1"/>
                            <Rectangle Fill="#8CFFFFFF" RadiusX="1" RadiusY="1" Height="18" Margin="2,0,2,0" Width="19" Grid.Column="1"/>
                        </Grid>
                        <Popup x:Name="Popup"/>
                        <Border x:Name="ValidationErrorElement" Visibility="Collapsed" BorderBrush="#FFDB000C" BorderThickness="1" CornerRadius="1">
                            <ToolTipService.ToolTip>
                                <ToolTip x:Name="validationTooltip" DataContext="{Binding RelativeSource={RelativeSource TemplatedParent}}" Template="{StaticResource ValidationToolTipTemplate}" Placement="Right" PlacementTarget="{Binding RelativeSource={RelativeSource TemplatedParent}}">
                                    <ToolTip.Triggers>
                                        <EventTrigger RoutedEvent="Canvas.Loaded">
                                            <BeginStoryboard>
                                                <Storyboard>
                                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="validationTooltip" Storyboard.TargetProperty="IsHitTestVisible">
                                                        <DiscreteObjectKeyFrame KeyTime="0">
                                                            <DiscreteObjectKeyFrame.Value>
                                                                <System:Boolean>True</System:Boolean>
                                                            </DiscreteObjectKeyFrame.Value>
                                                        </DiscreteObjectKeyFrame>
                                                    </ObjectAnimationUsingKeyFrames>
                                                </Storyboard>
                                            </BeginStoryboard>
                                        </EventTrigger>
                                    </ToolTip.Triggers>
                                </ToolTip>
                            </ToolTipService.ToolTip>
                            <Grid Height="12" HorizontalAlignment="Right" Margin="1,-4,-4,0" VerticalAlignment="Top" Width="12" Background="Transparent">
                                <Path Fill="#FFDC000C" Margin="1,3,0,0" Data="M 1,0 L6,0 A 2,2 90 0 1 8,2 L8,7 z"/>
                                <Path Fill="#ffffff" Margin="1,3,0,0" Data="M 0,0 L2,0 L 8,6 L8,8"/>
                            </Grid>
                        </Border>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
  6. 이제 완성된 Style를 컨트롤에 적용하면 에러가 표현될 것입니다.