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It doesn't do anything when I set it. TopLevelHideDelay works fine on the same menu though. I'm not doing anything in the code behind to that menu. Maybe I'm missing something. Here's the code below:
<telerik:RadMenu x:Name="radMenu" ClickToOpen="False" FontFamily="Segoe UI" Background="Transparent" ItemClick="OnRadMenuItemClick" VerticalAlignment="Top" HorizontalAlignment="Left" FontWeight="Bold" FontSize="14" TopLevelShowDelay="00:00:02.2500000" TopLevelHideDelay="00:00:02.2500000">