Sometimes you want put a button at the right-top corner, but there are many screen resolutions... and it should work an all of them.

So we need an API that works more or less like this:

  



  
// sets the button on the top-right corner of its parent 
button->setNormalizedPosition(1,1);

Since controls don't know when the parent change its size, that information needs to be passed in the visit... perhaps as flag.