using Emacs in LG3D ( a 3D Desktop)

[Amir Bukhari]

we in LG3D (Project Looking glass 3D) trying to build a 3d Desktop by using 
Composite Extension. we want to resolve all problem we encoured when using 
emacs with Lg3D.
I will describe the issue like following:
when opening emacs and click with mouse on a menu, a popup menu appear. now 
we move the mouse pointer to other menu (in menubar) when mouse over one of 
them, a popup window appear but on the old possition of the first opened 
menu.
it is not an issue in emacs, but rather in LG3D, because emacs works fine in 
other window manager or without WM.
to fix this issue I need to know how emacs create menu, does it grab 
(pointer) during a popup menu is opened!
any help will be apreciated!

looking to the code of emacs will not help because I don't know how it is 
organized.