As I understand you have define your ComboBox in GridViewColumn's CellTemplate. In this way the selection logic of RadGridView is not executed, since the combobox handles the mouse/keyboard events. Please consider to use CellEditTemplate instead. However, you can find the row by subscribing to combobox's event and execute the following code:
GridViewRow row = ((Combobox)sender).ParentOfType<
if (row != null)
// your code
I hope this helps.
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