Access control within datatemplate - wpf

Question

This is XAML:
<Window.Resources>
<DataTemplate x:Key="Temp">
<DockPanel Width="Auto" Background="White" LastChildFill="False">
<TextBox Name="txtBox" TextWrapping="Wrap" DockPanel.Dock="Left" Text="{Binding RelativeSource={RelativeSource AncestorType=ContentControl}, Path=Content}" Height="20" Width="100"/>
<StackPanel Orientation="Vertical">
<RadioButton Content="Option1" HorizontalAlignment="Left" Height="16" Width="112" Click="RadioButton_Click" />
</StackPanel>
</DockPanel>
</DataTemplate>
</Window.Resources>
<Grid>
<ContentControl ContentTemplate="{DynamicResource Temp}" Content="1"/>
</Grid>
This is codebehind:
private void RadioButton_Click(object sender, RoutedEventArgs e)
{
StackPanel sp = ((RadioButton)sender).Parent as StackPanel;
DockPanel dp = sp.Parent as DockPanel;
TextBox txtbox = dp.FindName("txtBox") as TextBox;
MessageBox.Show(txtbox.Text);
}
Is there a more simple way to access the textbox?
(As I know I can't get Parent of parent e.g. Parent.Parent...)

Answer 1

Your code is not that complex!
However, you could simplify it by using Linq-to-VisualTree:
private void RadioButton_Click(object sender, RoutedEventArgs e)
{
RadioButton rb = sender as RadioButton;
TextBox txtbox= rb.Ancestors<DockPanel>().First().Elements<TextBox>().First() as TextBox;
MessageBox.Show(txtbox.Text);
}
The Linq query above finds the first DockPanel ancestor of your RadioButton (i.e. the Parent.Parent that you wanted!), then finds the first TextBox child of the DockPanel.
However, I typically use Linq-to-VisualTree in cases where the query is more complex. I thin your approach is OK really!

Answer 2

Among other things you can add a reference to it in the RadioButton.Tag:
<RadioButton Content="Option1" HorizontalAlignment="Left" Height="16" Width="112"
Click="RadioButton_Click" Tag="{x:Reference txtBox}" />
private void RadioButton_Click(object sender, RoutedEventArgs e)
{
var textBox = (sender as FrameworkElement).Tag as TextBox;
//...
}