QGLWidget doesn't display children on Mac

[pshabash]

Hello,

Is there any special trick to placing other widgets inside QGLWidget?

On Mac (Snow Leopard), if I'm using Qt 4.7.3, built with Cocoa support, a QGLWidget's children are not displayed at all.
There is a note in the Qt doc that SIBLING widgets cannot be placed on top of a QGLWiget, but nothing about its children. Does this limitation apply to children also, though?

On Windows, children widgets are displayed, but not updated.

If anyone knows how to resolve it, particularly on Mac, any help will be appreciated.

Thank you
Paul