We were able to reproduce the described issue and I logged it in our Feedback portal. You can easily track its status on the following link:
What I can suggest as a workaround would be to use a DispatcherTimer in order to focus the TextBox a little bit later. So if you are opening the Confirm dialog with a Button the code behind should looks as follows:
TimeSpan(0, 0, 0, 0, 600);
timer.Tick += timer_Tick;
sender, EventArgs e)
sender, Telerik.Windows.Controls.WindowClosedEventArgs e)
sender, RoutedEventArgs e)
Owner = Application.Current.MainWindow,
DialogStartupLocation = WindowStartupLocation.CenterOwner,
Closed = Cancel_Click,
Hope this will work for you. I have also updated your Telerik points for your involvement.
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