title: extending an existing flex component
body: <p>this is a pretty basic question but I can't seem to get it right.</p>
  
  <p>If I want to extend an existing component, what is the right way to do it? For example, this thread talks about it, but doesn't give an example: <a href="https://stackoverflow.com/questions/710646/flex-datechooser-events-for-individual-days">Flex DateChooser events for individual days?</a></p>
  
  <p>A simple example of just adding a trace("this is my function") to an existing function of a component would be helpful.</p>
  
  <p>Thanks.</p>