This behavior is expected - by design RadMenu has a higher z-Index value than the RadWindow control. This is needed in common cases where a RestrictionZone
is used and the RadMenu control is above that zone. To render the RadWindow control above RadMenu, all you need to do is to change its z-Index, according to this help
article. There is a KB article
on the same subject as well.
the Telerik team
Watch a video
on how to optimize your support resource searches and
check out more tips
on the blogs.
Follow the status of features or bugs in
and vote for them to affect their priority.