Placing a variable containing a Menu selection inside aspecific Cell of a datagrid

[LittleMuscle]

i have a function that gets the menu selection and then places the cursor into
the specific field i want to insert the record into; and once in the cell i
have a itemEditBegin function called but i don't know what method to call to
drop the menu selection into the cell :

private function menuHandler(event:MenuEvent):void {
dg.editedItemPosition = {columnIndex:colIndex,rowIndex:row};
menuChoice=event.item.@label;
}

private function dgEditBeg(event:DataGridEvent):void {
//HERE'S WHERE I TRY TO PUT THE MENU SELECTION (VAR menuChoice) into the cell.
//event.currentTarget.selectedItem.MMPTA_video. = menuChoice;

dg.editedItemPosition = {columnIndex:colIndex+1,rowIndex:row};

}