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.
All the best,
the Telerik team
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