Setting Coordinates for Dynamic popup list

Hi
I am creating a dynamic popup list using the following code

   iGrid = new ( ELeave ) CAknGrid;

   CAknPopupList* popupList = CAknPopupList::NewL( iGrid,
       R_AVKON_SOFTKEYS_SELECT_BACK );
   CleanupStack::PushL( popupList );

   iGrid->ConstructL( popupList, CEikListBox::ELeftDownInViewRect );

but have not found any way to set its coordinates.As by default it takes some other values.
Do tried the functions given in CAknGrid and CAknPopupList classes but then too its not showing the result.

will be gratefull if anyone can help me out with this.
thanks in regards