Cool stuff
I like how you set up the tree system... does it take into consideration children of children? If it doesn't, I think that'd be a good set-up.
Also, while the dump is useful I think it's fairly messy. I think it should be better formatted. For one, use a fixed width font like courier new. Two, better divide the GUI's. Maybe a format like:
PHP Code:
NameOfGui (type: GUIWindowCtrl):
var = 0 [integer]
var2 = "foo" [string]
var3 = {0,0} [array]
As well as spacing between the GUI's, to quickly differentiate one GUI from the next.