[mtasc] extending UIComponent

[Tiago Simões]

- fixed problem with -mx (classes initialized before mx components)
Wasn't this last version supposed to be able to compile classes that
extend mx classes (like using components or cellrenderers that extend
UIComponent) , or did I got this wrong?

I'm still not able to do it, am I missing something? Do I need to do
that trick with the frames?

Cheers,
Tiago