Make sure that the Form COntrols Toolbar is visible, click on the control of your choice then drop that control onto the grid column (Make sure that the grid is in edit mode before you start). As far as I know this is the only way to do it, but it does mean that you are only able to add controls form the base classes - you cannot do the same thing for sub-classed controls form your own libraries.

Hope this helps

Tony Bater