Ok, see if you can stay with me.

I have 2 forms. Each form has a TreeView control on them.

On right click of the TreeView on the first Form, I popup a menu.
When I click the menu, the second form is shown modal to the first form. When I do this, I cannot get the menu to popup on the second form when I right click the TreeView there.

However, if I don't right click the first form but insted use the menu from the top of the form to show the second form, I can then right click and get the popup menu on the second form.