control displays external pages in an IFrame
object that is positioned on top of the SIlverlight
plug-in. This means that the page displayed in the HtmlPlaceholder
is displayed above all other Silverlight content in your application.
I believe that this is the reason you're experiencing the described issue in your project. In order to workaround it, you can collapse the RadHtmlPlacehoder
before navigating away from its view and displaying it back (setting its Visibility
back to Visible
) once its view is navigated back to.
the Telerik team