Take a look at Thread #555520. It's not the same problem but similar.

>Could someone please confirm this or tell me if its already been reported/fixed.
>
>If you create a Grid with a table as a record source but there are no displayable records. The code in the Grid.RightClick() does not appear to fire!
>
>The exact same screen works as expected in VF6.
>
>I have been testing this with a standard VF grid no classes!
>
>Any help would be appreciated.
>Thanks