You can change the image of the expander or other expander properties using the ViewCellFormatting event:
Bitmap bitmap =
sender, CellFormattingEventArgs e)
GridGroupExpanderCellElement && e.Row.ChildRows.Count > 0)
((GridGroupExpanderCellElement)e.CellElement).Expander.SignImage = bitmap;
I hope you find this useful. Do not hesitate to contact us if you have further questions.
the Telerik team
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