Associate a minimize zone to QMainWindow

[lixo1]

Hi everybody,

I would like to know if someone can help me in the following problem:

I created a Qt application that uses 2 QMainWindow, the first is the main window (get data), the second is the results window.

On Linux Ubuntu every time when I launch the second window it creates a new minimize zone (at the menu bar), and it's very good because I can pass from the main to the results, and launch many other results, and I get the control from all.

The problem is the following:
Now on Windows it cannot create a minimize zone [see picture] for every result window, so I have only 1 minimize zone, and it's very difficult to pass from one to the others (also alt+tab doesn't work). Is there a way to force the creationg/association of a new minimize zone when a QMainWindow opens?

Thank you very much for any kind of help,
Cheers,
Louis