Usually, you can set the AutomationId of a FrameworkElement using the AutomationProperties.AutomationId attached property. However, because of the specific implementation of RadVirtualGrid, there are no separate visual elements per row or cell, so you cannot use the approach with the attached property. But, there are custom automation peers for the cells which can be customized. Add an API that allows you to set the AutomationId of the cells when the peer (VirtualGridCellInfoAutomationPeer) or the cell info is created.