Actionscript 3 :: Place An Edited Containers Class?

I would like to modify an Accordion class to suit my needs.Instead of simply extending Accordion, I would like to copy and paste the whole class as a start, with the new class name "MyAccordion", into the src folder; to gain the maximum freedom(I assume).

However, several problems encountered. For the "include "../core/Version.as";" error, I had solved by replacing it with a explicit Version static const string. But for the problems lead by the inheritance, e.g. AccordionHeader, etc, I found that there would be too many files to be edited when going down the stream. I suspect I mis-understand the whole logic of editing the class.