Currently the best approach that I can come up with is to set the ImageUrl
property to each tab to a blank image and then apply a different css class to each of the tabs. Thus, you can assign one and the same sprite image with different background position. You can refer to the attached file for an example how this can be implemented with the RadPanelBar control. The approach would be the same for the RadTabStrip control.
All the best,
the Telerik team
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