<Window x:Class="WpfAppExamples.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="RadioButtonSample" Height="150" Width="250">
<Window.Resources>
<Style TargetType="RadioButton" BasedOn="{StaticResource {x:Type RadioButton}}">
<Style.Triggers>
<Trigger Property="IsChecked" Value="False">
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
</Trigger>
</Style.Triggers>
</Style>
</Window.Resources>
<StackPanel Margin="10">
<Label FontWeight="Bold">Are you ready?</Label>
<RadioButton GroupName="testing">Yes</RadioButton>
<RadioButton GroupName="testing">No</RadioButton>
<RadioButton IsChecked="True" GroupName="testing">Maybe</RadioButton>
</StackPanel>
</Window>
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