Focus not working for Textbox for Radwindow

[prejesh vp]

Hi,
I have an texbox inside radwindow , I am not able to focus the textbox using code inside radwindow, however i am able to do the same in silverlight usercontrol. Below is the code used.Please do the needful.

HtmlPage.Plugin.Focus();

theTextBox.Focus();

[Humayon]

try
      public userControl1()
        {
            InitializeComponent();
            Loaded+=new RoutedEventHandler(userControl_loaded);
     }
void userControl_loaded(object sender, RoutedEventArgs e)
{
  ThetextBox.focus();
}

[prejesh vp]

Still not working.please help.

[Humayon]

try again
      public userControl1()
        {
            InitializeComponent();
            Loaded+=new RoutedEventHandler(userControl_loaded);
     }
void userControl_loaded(object sender, RoutedEventArgs e)
{
 new System.Threading.Thread(() =>
         {
            this.Dispatcher.BeginInvoke(() =>
            {
                 ThetextBox.focus();
            });
         }).Start();    




}