Hi Manishkumar,
Using a HierarchicalDataTemplate does not harm the scrolling functionality at all. The issue here is that the ScrollViewer needs to be placed with regards to the type of menu items that will be scrolled. For example, if you want the top level submenu items to be scrollable, you need to add a ScrollViewer to the TopLevelHeaderTemplate of the RadMenu control.
I prepared a sample that fits your scenario and illustrates the scrolling of the top level submenu items of RadMenu. I hope this will be helpful.
Best wishes,
Dani
the Telerik team
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