again Open Cascade + Qt 4.2.2 but detailed...

Hi,
i know i m putting the same question again but i m sure that this time i m asking relevant information of Qt.
i hope this time i m not wasting anyone's time by asking the similar ques again.
i m making an MDI application.now if i m inheriting the child window fm QGraphicsView because i want 2D and 3D features(zooming,rotating an all..) for the child window. But here comes Open Cascade in the picture when i want to use Open cascade APIs to draw on the child windows.
now my ques is how can i use the APIs of Open Cascade to draw images on the appln (or child window) made in Qt.
i m using evaluation version of Qt 4.2.2 and Windows XP and Open Cascade 5.2 and Visual Studio C++ 6.0?
i hope this time the ques is relevant to Qt too..

thanks in advance for giving time to my Ques in advance :)