Is there a reason why tooltips can not be set at Design Time on buttons?
All controls from the Telerik UI for WinForms suite have the ToolTipTextNeeded event which can be used for dynamically setting the text of the tooltips: https://docs.telerik.com/devtools/winforms/telerik-presentation-framework/tooltips-and-screentips/tooltips
Setting the tooltip at design time for RadButton is not an option. Feel free to use the mentioned event and specify the tooltip text.
I hope this information helps. If you need any further assistance please don't hesitate to contact me.
Dess | Tech Support Engineer, Principal
Love the Telerik and Kendo UI products and believe more people should try them? Invite a fellow developer to become a Progress customer and each of you can get a $50 Amazon gift voucher.