flickering with compiz and kde apps

[Giovanni Masucci]

Hi everybody.
I'm using Xgl and I find it very good.
No problems so far, I just have one question/wishlist.
When I resize/open gnome and gtk apps with compiz enable I have no flickering 
at all. In kde and qt apps instead I get it and also in qt4 apps.
Does this happens because there is no kde-window-decorator yet or there are 
other reasons?
Thank you and thanks for xorg and xgl. :)
Giovanni