flash - Casting Variables to a Movie Clip -

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how can convert gecko object movie clip?

function finish(boxname, arrayname:array):void {  each (var item:string in arrayname) {     trace(boxname+"_"+item);     var gecko:movieclip = (boxname+"_"+item) movieclip ;     trace(typeof(gecko));     gecko.gotoandplay("glow");     }    }

this gives following error: 

high_hsymbol_1 object typeerror: error #1009: cannot access property or method of null object reference. @ quizz_fla::maintimeline/finish() @ quizz_fla::maintimeline/dropit()

boxname+"_"+item should reference movieclip, no need casting think not possible string movieclip. associative arrays. supposed movieclips childs of "this":

var gecko:movieclip = this[boxname+"_"+item];

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