VS 2010 Which event needed to capture value change in DGV Combobox?

Hi,

I have a datagridview where one of the columns is a combobox. I want to add some code which is triggered when the selected item in the combobox is changed, but before the cell is left. The SelectionChanged event is only fired when the user has left the cell. What I want is this: Say you've dropped the combobox down and are say using the down arrow key to scroll through the items in the combobox, I want to run some code each time the highlighted value in the combobox is changed.
Is this possible?

Thanks

Kristian