Hi Ariel Ben Horesh,
Generally, if you want to predefine the default behavior of scrolling, you may either change the actions of the scroll buttons (you may take a look at our online documentation for a reference) or handle ScrollChanged event of the ScrollViewer:
Considering your specific case, I am not quite sure what is the exact behavior that you want to achieve. Do you want to remove the last item from the view and change the number of items per page ?
All the best,
the Telerik team
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