By default, GridDataBoundGrid displays a triangle in the row header cell of the currently selected row. Refer to the following screenshot.
You can achieve this by changing the row header BaseStyleMap to Header and handling the PrepareViewStyleInfo events. In PrepareViewStyleInfo, you can also change the e.Style.Text (for text) or the e.Style.BackgroundImage (for images).
Refer to the following code example for changing BaseStyleMap.
Refer to the following code example for changing text or image in PrepareViewStyleInfo.
The following screenshot displays the RowHeader replaced with another image and text.
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