After adding the GridContextmenu to a Grid or Treegrid the menu ist already visible (only a short black line, because not items are added yet). I haven't added any header, body or footer listener yet. Should this be the case?
I would expect, that a menu is only visible after adding a menu to header, body or footer.
Furthermore after adding only a "addGridBodyContextMenuListener" the same menu appears in the header. I think this isn't correct yet.