Problem while using a control inside a grid

i am inserting a combobox while clicking on a cell. user can select a value for a cell from that combo box. i was able to insert the combo box to the grid but i was not able to select a value from that combo

i am creating a combo object and inserting through setCellTemplate()
if i am using setRowTemplate it is very well working.

never mind i got the answer for that. i was using AW.UI.Combo instead of Aw.Templates.Combo.