Change sub mcs' visible property using "for loop" problem

hi. just like in the pic, i have 2 buttons on the stage plus and minus and there is a mc called submc in the stage. and there are 10 other mc in the sub mc.
i like to add and remove 10 mc one by one with the buttons in the stage but i can’t get it with for loop. every single hit on the minus button add one mc on the submc movieclip.

pic url:
upload.omeraslanbakan.com/soru.jpg

this is the code i use:

btn_plus.addEventListener(MouseEvent.CLICK, mcFramePlus);
btn_minus.addEventListener(MouseEvent.CLICK, mcFrameMinus);

function mcFramePlus(Event:MouseEvent):void
{
var i:uint = new uint
for(i=1; i<11; i++)
{
MovieClip(submc).mc*.visible = true
}
}

function mcFrameMinus(Event:MouseEvent):void
{
var i:uint = new uint
for(i=1; i<11; i–)
{
MovieClip(submc).mc*.visible = false
}
}

i can’t add the movieclips that’s a problem and i dont know how to remove the last added mc’s with minus button.
sorry for bad english.