Thank you for your interest in RadContextMenu.
In accordance with the Design Templates for Windows Phone 7
, provided by Microsoft, the ContextMenu as a concept in Windows Phone should not include more than 5 items, because including more items would influence the user experience and would make the items harder to select. This is why RadContextMenu does not support scrolling of its items, as it is not expected that there will be too many of them. If your application requires more than 5 items, then you should probably consider choosing something different than a context menu to display the items, for example RadWindow, or you can try to refactor your project in a way that it doesn't require so many items displayed at once.
I hope this information is helpful.
the Telerik team
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