WPF - Focus Control Within DataTemplate applied to FlyoutControl

Question

I have a DataTemplate which contains a TextBox. The DataTemplate is bound to the ContentTemplate property of a Style for the DevExpress FlyoutControl. The Flyout Control itself is within the ControlTemplate of another TextBox.

When the TextBox with the FlyoutControl is focused, I want to redirect focus to the first TextBox in the FlyoutControl's ContentTemplate (from the DataTemplate). Setting FocusManager.FocusedElement={Binding RelativeSource={RelativeSource Self}} on the TextBox I want focused accomplishes this the first time, but once the Flyout has loaded it no longer works.

I have tried every suggestion I can find and nothing so far has worked. I can get the TextBox I want to reference in code and call Focus(), but it always returns false. At best, when I try to focus it in code, the Flyout is focused instead, but never the TextBox within the Flyout.

Here is what each relevant part looks like (irrelevant code omitted):

<DataTemplate x:Key="FlyoutTemplate">
   <Grid>
      <dxe:TextEdit x:Name="TextThatWantsFocus"
        FocusManager.FocusedElement={Binding RelativeSource={RelativeSource Self}}" />
   </Grid>
</DataTemplate>

...

<Style x:Key="FlyoutStyle" TargetType="dxe:FlyoutControl">
   <Setter Property="ContentTemplate" Value="{StaticResource FlyoutTemplate}"/>
</Style>

...

<dxe:TextEdit>
   <dxe:TextEdit.Template>
      <ControlTemplate>
         <StackPanel>
            <dxe:TextEdit x:Name="InnerTextEdit" />
            <dxe:FlyoutControl Style="{StaticResource FlyoutStyle}"/>
         </StackPanel>
      </ControlTemplate>
   </dxe:TextEdit.Template>
</dxe:TextEdit>

The flyout is being opened in code. It is here that I also would like to focus the TextBox (TextThatWantsFocus). However, nothing I have tried will give it focus (except for FocusManager handling it the first time), including the typical SO answer involving triggers. Any ideas would be greatly appreciated.

Answer 1

I took DmitryG's advice and submitted a DevExpress support ticket, and they were able to provide a solution.

The issue was resolved by handling the Loaded event of the TextEdit I want focused and using the dispatcher to focus it:

private void TextThatWantsFocus_Loaded(object obj, RoutedEventArgs e)
{
    var text = obj as FrameworkElement;
    Dispatcher.CurrentDispatcher.BeginInvoke(new Action(delegate()
        { text.Focus(); }));
}