[Lazarus] Adding functionality to a control

[Timothy Groves]

Hi!  I want to add some features to TMemo.  Unfortunately, I am still 
weak on Lazarus.  Is there a decent tutorial on extending the 
functionality of a control?  In particular, I want to add some (limited) 
formatting colour and line numbers, so I need to override whatever 
method is used to actually display the text.  (I can't even figure out 
what method that is...)