Input text inside dragable movie clip

1

hi,.sory for maybe my common question,.
i’ve been search in google and this site for 2 day and still not found the answer
so maybe if i’m ask there would be answer.

i was create a input text field inside a movie clip
movie clip > input text field
i am creating a dragg able game,so this movie clip was called from library and then i give it dynamic listener for dragging ability


var mc:hub = new hub();
    mc.name="myClip"+ke;
    this.addChild(mc);
    mc.y=yStart;
    mc.x=xStart;
    getChildByName(mc.name).addEventListener(MouseEvent.MOUSE_DOWN, pickhub);
    getChildByName(mc.name).addEventListener(MouseEvent.MOUSE_UP, drophub);

my question is,if i click input box,there would be error like this


ReferenceError: Error #1069: Property stopDrag not found on flash.text.TextField and there is no default value.

i was search from internet and have solution to set mousechildren to false,but if i do it,i could use my input field
second question is how i acces my input text
if i use movieclipname.inputtextname.text it got error.,
i can use getChildByName because i add many of this movieclip from library.

thank you very much for ur help and sory for my english