DuplicateMovieClip from stage?

hi there guys, for first sorry for my english.

i was looking for duplicateMovieClip() in AS3.0, i have readed many things about it but still cannot duplicate movie from stage.

in CS3 i drawed something then converted it to movieClip and give it an instance name, how can i duplicate it in AS3.0?

P.S i tried senocular’s dulicateDisplayObject


import com.senocular.display.duplicateDisplayObject;
var newInst:Sprite = duplicateDisplayObject(myMC, true) as Sprite; 
newInst.x = 100; // shift to see duplicate

it gives me error

Implict Coerecion of a value of type Class to an unrelated type flas.display:DisplayObject