Creating a custom UI/Menu

[Pixie_]

Hi, I've been playing around with SC2's Galaxy editor for a few days now. And I've seen people that have created really nice custom UI's, menus and so on. I've searched a little for UI Tutorials, but I was wondering if someone knew a good introduction to custom UI creation in the sc2 editor which they hopefully could re-direct me too, unless anyone feels like posting a shorter summary on it here. I'd appreciate it, thanks.