Thank you writing.
You have to use ToolTipTextNeeded event to set up ToolTips for these buttons. Please consider the following code snippet:
sender, Telerik.WinControls.ToolTipTextNeededEventArgs e)
RadImageButtonElement && ((RadImageButtonElement)sender).Class ==
RadItem item = sender
I hope this helps. Let me know if you have any additional questions.
All the best,
the Telerik team
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