PushButton (Component)

I am reading the chapter on components in the book “Game Development With ActionScript” by Lewis Moronta. I have been trying to find the PushButton component in the UI components folder. I only found the Button component. The Button component does not have, as far as I can tell, the Click Handler parameter. My question is where can I find teh PushButton component? or how can I use Button component? I realize this is a very simple (stupid) question, but I have not been able to solve it myself. Thank you for your help.