GUI with pyRoot only

Hello all again,
I have tried to build an example of a Root GUI with a couple of buttons with pyroot only (no qt here).
I managed to have it almost working :
+ the window shows up with the canvas inside and I can close it safely with the cross
+ the window can be resized or moved with no problems

The problem is that I cannot make the "Connect" between a button and a function, a the connect methode ask for a void pointer (usually 'this' in c++) that I cannot provide (using 'self' gives a seg. fault).

Here is the main :

    tgwindow = ROOT.gClient.GetRoot()
    window = gMainWindow(tgwindow, 200, 200)     ROOT.gClient.WaitFor(window.MainFrame)

The last line is the trick I found, not to have the application hanging up...
See the script attached and comments inside, Best Regards,
Johan