conflict between QT OpenGL and native OpenGL

There is a conflict when using both QTOpenGL and NatieOpenGL in the same application.

There is always a problem when switching from using QTOpenGL to using NativeOpenGL.
QTOpenGL works fine when called after NativeOpenGL but Native OpenGL cannot initialize when called after QTOpenGL.

Possible problem:
QT OpenGL does not release all resources when calling the destructor of QGLWidget object.

Please note I attached here also a small N900 application that demonstrates this bug.