Duplicate movieclip

I have created a button…
how would I script and apply the script to make the button duplicate through the duplicate movieclip action?

As the AS says it’s duplicateMOVIECLIP not button, so you’ll have to make you button into a clip either by selecting it, hitting F8 and selecting movi clip, or check out the movie clip (use labels of _up, __over and _down on different keyframes) button and then use this tutorial : http://www.kirupa.com/developer/actionscript/duplicate.htm