I've always found GUIs to be the easiest part of GS2.
I usually use the GUI editor, then modify the crap out if it since the syntax is horrible. It bugs me that not every type of control is on it, though. That and, when you reconnect with it open, you have to close Graal and reopen it to get it to work.
Nice custom GUI, though.
I wish Valikorlia had one.