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| <TextBox> <TextBox.Style> <Style TargetType="TextBox" xmlns:sys="clr-namespace:System;assembly=mscorlib"> <Style.Resources> <VisualBrush x:Key="CueBannerBrush" AlignmentX="Left" AlignmentY="Center" Stretch="None"> <VisualBrush.Visual> <Label Content="浮水印顯示文字" Foreground="LightGray" /> </VisualBrush.Visual> </VisualBrush> </Style.Resources> <Style.Triggers> <Trigger Property="Text" Value="{x:Static sys:String.Empty}"> <Setter Property="Background" Value="{StaticResource CueBannerBrush}" /> </Trigger> <Trigger Property="Text" Value="{x:Null}"> <Setter Property="Background" Value="{StaticResource CueBannerBrush}" /> </Trigger> <Trigger Property="IsKeyboardFocused" Value="True"> <Setter Property="Background" Value="White" /> </Trigger> </Style.Triggers> </Style> </TextBox.Style> </TextBox>
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