使用以下XAML,我怎样才能在按钮的事件处理程序中获取对选定单选按钮的引用?
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525" x:Name="myWindow">
<Grid>
<StackPanel>
<RadioButton Content="A" GroupName="myGroup"></RadioButton>
<RadioButton Content="B" GroupName="myGroup"></RadioButton>
<RadioButton Content="C" GroupName="myGroup"></RadioButton>
</StackPanel>
<Button Click="Button_Click" Height="100" Width="100"></Button>
</Grid>
</Window>