Hello Manfred Pohler,
Thank you for writing us.
Currently, we don't support scrolling in RadTabStrip
at design-time. We will consider adding such a functionality in the future releases of RadControls for WinForms.
However, if you need to explicitly set some properties of the tabs, you can open the Items Collection
editor of RadTabStrip
and change the tab properties you need to.
I hope this helps. If you have any further questions, please contact me.
the Telerik team