two simple inheritance questions

Hello there...two simple questions.

I'm making a tabbed text editor. So, multiple files are open at the same time. Ok, now I realised that inheriting a new richeedit would be just great to solve some problems: know the complete file name of the text file opened in each tab, know if text is saved or if it contains modifications that were not saved.

However, when I sat to do this..I found out it was not as easy as I supposed. First question: how do I override a property? specially if it´s an event. For example, RichEdit's OnChange event. I would like to do something and then let the inherited OnChange do it's part. Second question: how do I override a Richedit's Line.Save/LoadToFile properties? I mean, they are not simple methods that correspond directly to the Richedit class..they correspond to an object incorporated to that class.

Examples (even if they are short) would be greatly appreciated!

thanx in advance,
paul.