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yes, you can do everything, but the more interesting question is why and how much time do you like to invest?
ListBase is a public class and you can inherit your own ListClass from it (in Actionscript 3 ), but I guess it will cost some time (the Listbase class has round 8000 lines of code in flex sdk version 3)
So If I understand, it is possible in actionscript by overriding some methods but NOT in MXML.
yes, MXML is a XML-based markup language and Actionscript is a object-oriented programming language which handles user interactions with the application and so on.
I would suggest MXML for rapid development and layouting and actionscript for everything else (example: new components etc. )
If someone wrote a new list control, just use it with MXML. If you like to overwrite some basic behaviours, make a new class which extends the list control and overwrite the functions you like to change. Thats it.