Dynamically loading a movieclip...

Hi All..
I know this sounds pretty pathetic.. but I can't get to load a movieClip dynamically...
I have this code:
import flash.display.MovieClip
var myButton:MovieClip = new MovieClip;
myButton.x = 30;
myButton.y = 30;
addChild(myButton);
Also, I exported the movieClip to ActionScript with the name of myButton..
When I test the movie- there're no errors, but there's nothing on the stage..
Please help...

if you have a movieclip in the library with class name myButton, use:
var mybutton:myButton=new myButton();
addChild(mybutton);

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