Hi Matt,
I was able to observe the issue, RadMenu has z-index set to "7000", so you should set higher z-index to the window. I see that "windowZIndex" class is rendered for the window but wasn't able to find its definition, could you please add it like this:
and let us know how it goes.
Best wishes,
Yana
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Explore the
Telerik Public Issue Tracking
system and vote to affect the priority of the items