Refering to this question I asked a while ago:

UI functionality modeling languages

It looks like there is no good-enough solution. I decided to develop one. (and prepare a set of elements for DIA or something) I'm sure it will require a good insight in peoples' experiences and problems in designing functionally complicated GUIs.

I've got some ideas already, but I'd like to hear from You what You'd expect from a GUI functionality modelling language.

Clarification: It's functionality modelling, so it's not about where I put a button. It's about objects that have some events binded, and the interface behaviour logic.

If You think (just as I do) that UML is far from useful for such purposes - feel free to put Your expectations here. I'll try to meet them. ( not necessarily in person;) )

Remember - there is no such thing as a wrong answer to this question