<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="RSS Reader">
<StackPanel xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Width="200">
<StackPanel.Resources>
<Style TargetType="{x:Type TextBox}">
<Style.Triggers>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=Text}" Value="disabled">
<Setter Property="IsEnabled" Value="False"/>
</DataTrigger>
</Style.Triggers>
<Setter Property="Background" Value="{Binding RelativeSource={RelativeSource Self}, Path=Text}"/>
</Style>
</StackPanel.Resources>
<TextBox Margin="3"/>
</StackPanel>
</Window>
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