Hello Raanan,
You can use a
RadDropDownButton with a
RadGallery and a
RadMenu controls in its
DropDownContent. In the bottom of the
DropDownContent you can define a Thumb to create a resizing logic. I attached a sample project to get you started on this approach. Let me know if it helps.
All the best,
Tina Stancheva
the Telerik team
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