ReFreshing a Window

[Dimitri Holz <d holz innoventis de>]

I use a resize() - methode to change a size of my window, but I do it in 
a do-while-trails to see the change-effect:

void MyWindow::change_size()
{
   int x=100, y=100;
       do
       {           
           MyWindow::resize(x, y);
           .......................................................
           x++;
           y++;
       }while(x<800||y<800);       
}

but the problem is that you see only the first and the last size and I 
can`t find a GtKmm-methode for refresh a window like    ::refresh()   ; 
or   ::reload()    or so. How can I solve this problem?