You can achieve the desired result by using an approach similar to the one demonstrated in the Dropdown with headers
demo from our SDK Samples Browser
. For the purpose, rather than use a GridViewComboBoxColumn
, you should use a GridViewDataColumn
and specify a CellEditTemplate
for it containing the RadComboBox from the example.
I hope you find these resources helpful. Please let me know if you require any further assistance from my end.