Assuming that your SL app is running in-browser, you may want your SL app to have initial focus, e.g. when it loads a splash screen, the OK button has focus.

You can help achieve this by using System.Windows.Browser.HtmlPage.Plugin.Focus(); in your loaded event handler for your usercontrol\childwindow, e.g.:

        private void ChildWindow_Loaded(object sender, RoutedEventArgs e)
        {
            // ensure SL plugin has focus
            System.Windows.Browser.HtmlPage.Plugin.Focus();
        }

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