Cant removeChilds

Hey i have problem:

am adding childs with this code:

function show_time(){

    var i:int;

        for (i = 0; i < dataArray.length; i++){

            var kalendorius:MovieClip = new calendar;

            kalendorius.name = "data"+i;

            addChild(kalendorius);

            kalendorius.x = ix;

            kalendorius.y = iy;

            timeArray = dataArray.split(" - ");

            kalendorius.menuo.text = timeArray[0];

            kalendorius.diena.text = timeArray[1];

            kalendorius.savaites_diena.text = timeArray[2];

            kalendorius.time1.text = timeArray[3];

            kalendorius.time2.text = timeArray[4];

            kalendorius.patvirtinimas.text = timeArray[5];

            a++;

            iy=iy+335;

        }

}

Butt now I don`t understand why I cant remnove childs with this:

function reload_calendorius(){

    while (kalendorius.numChildren > 0) {

        kalendorius.removeChildAt(0);

    }

}