I'm having issues with the child Menu Items disappearing after I navigate to a different page. The child items appear the first time I click on them, but when I navigate back to the original page, they do not appear when I mouse over the parent Item. When I mouse over the parent item a second time, my entire application disappears and displays a white background.

I have noticed that the main menu bar across my site does not experience this issue. It is only when I have a second menu, OR an Expander Control, that this problem appears (on the second menu). The main menu doesn't seem affected by this issue.

Hello Christopher,

The problem that you describe sounds like the problem in Silverlight 2 (the bug is that you cannot have ItemsControl with Popup in the template and this popup to hold the items of the ItemsControl - this is the case with RadMenuItem). One solution is to avoid setting x:Name attribute on the RadMenuItems.
But the problem may be different so if you could send us simple project demonstrating this issue it will be of great help.
Thanks.

Sincerely yours,
Hristo
the Telerik team