trunk rev 255526, Firefox 10.0.2, Chrome 17.0
Issue that I have reported seems to be resolved. (
I was able to add screen on screen.
But, I never change that screen item with Firefox and Chrome.
Because 'change' link is not available on screen edit view.
(Child screen have only a graph item.)
If I use IE8, I can change that screen item.
I was tested by :