[flexcoders] How to add more context menu???

[lehaianh1986]

Hi every body. I want to add my function when I click on word in text area 
(like copy, paste, ..etc). I follow the guide in 
http://www.adobe.com/devnet/air/flex/quickstart/adding_menus.html
But what i want is add my function to default context menu, not instead of 
remove default context menu.
Can anyone help me? Thank in advanced!!!