Unable to draw OpenGL based widget inside widget drawn using Qt:: WA_TranslucentBackground

This is an iPad image which serves as the 'base' widget - http://imgur.com/RnSghvV

I need to draw this as a standalone widget, and then in the viewport, render other elements (drawn through OpenGL). The attached code works fine in Mac.

With this, the iPad image comes up correctly. But when I try to add the OpenGL rendered QWidgets inside it, they show up blank in Windows.

It works fine in Mac, and for other kind of sub-widgets in Windows as well, only problem is with OpenGL based sub-widgets in Windows, due to the property Qt:: WA_TranslucentBackground.

Any solution which renders the sub widget correctly will be okay. or if that is not possible, a solution involving displaying the iPad image widget without using Qt:: WA_TranslucentBackground will be okay as well.