OpenGL ES and QT

Can anybody help me?

I have a problem: when I run hellogl_es example, I can see only upper part with “OpenGL ES Example”, bottom part with “A QGLWidget with OpenGL ES”, but I haven’t middle part - QT symbol on black background.

What I use:
Microsoft Visual studio 2008
Windows Mobile SDK 6
Vincent ES 1.0.0

I tried on WM 6 Emulator and on smartphone, but I had the same result

Other examples (which use QT for WM or OpenGL ES without QT for WM) work without problems.

Thank you