How Do I Give a Textbox Focus in Silverlight?

Question

In my Silverlight application, I can't seem to bring focus to a TextBox control. On the recommendation of various posts, I've set the IsTabStop property to True and I'm using TextBox.Focus(). Though the UserControl_Loaded event is firing, the TextBox control isn't getting focus. I've included my very simple code below. What am I missing? Thanks.

Page.xaml

<UserControl x:Class="TextboxFocusTest.Page"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    Loaded="UserControl_Loaded" 
    Width="400" Height="300">

    <Grid x:Name="LayoutRoot" Background="White">        
        <StackPanel Width="150" VerticalAlignment="Center">            
            <TextBox x:Name="RegularTextBox" IsTabStop="True" />    
        </StackPanel>        
    </Grid>
</UserControl>

Page.xaml.cs

using System.Windows;
using System.Windows.Controls;

namespace PasswordTextboxTest
{
    public partial class Page : UserControl
    {
        public Page()
        {
            InitializeComponent();
        }

        private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {
            RegularTextBox.Focus();
        }
    }
}

Answer 1

I found this on silverlight.net, and was able to get it to work for me by adding a call to System.Windows.Browser.HtmlPage.Plugin.Focus() prior to calling RegularTextBox.Focus():

   private void UserControl_Loaded(object sender, RoutedEventArgs e)
   {        
      System.Windows.Browser.HtmlPage.Plugin.Focus();
      RegularTextBox.Focus();
   }