Carlo--
There is a 64-bit version of GDImage written in C++.
It works just the same than the PB's version.
And there is also the WinLIFT 64-bit version.
When mixed together you can produce professional UI like that:

However the GUI conception is very different of what you are accustomed to, because all controls are indeed graphic components working in composited mode (like in Photoshop).
The whole GUI is fully customizable: image background, graphic components, text, skin theme.
Each one in a distinct transparent layer (using png images with variable opacity).
You can even produce state of the art 3D chart like this one:
http://www.jose.it-berater.org/smfforum/index.php?topic=4869.msg20027#msg20027...