Mozilla menu implementation

Hi,
we are working on a 3D Desktop "Project Looking Glass 3D" and working
hard to integrate X Application in our desktop. to let X Application
rendered in our Desktop we redirect all Window (also non-redirect one)
to backing store (by using Composite Extension) and then rendered it
using java 3D. as far as now Mozilla work fine but we alot of problem
with Menus. sometime is we get that a menu want to place itself on
location 0,0. is there such request from your side?

here what we do in our 3D Window Manager:
1- when getting ConfigureRequest, we just configure the window
(XConfigureWindow().
2- when we getting MapRequest, we reparent it and then redirect it to
offscreen and then map it.
3- at the end we get MapNotify and at this point we rendered it!

in point 1 we get some time request to configure non-redirect window in
location 0,0.
Could help me here with information?
I am new to Window Manager stuff!
-- 
Amir Bukhari <[email protected]>