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dynamic class mycustommc extends MovieClip
{
//创建静态方法，大家可以查一查Object.registerClass()的用法
static function register()
{
Object.registerClass("__Packages.mycustommc",mycustommc);
}

function mycustommc()
{

this.beginFill(0xCCCCCC,50);
this.lineStyle(1,0xFF0000,100);
this.moveTo(0,0);
this.lineTo(10,0);
this.lineTo(10,10);
this.lineTo(0,10);
this.endFill();
}
function move(aX:Number,aY:Number)
{
this._x = aX;
this._y = aY;
}
}
---------------------------------------------------
import mycustommc;
mycustommc.register();
it1 = attachMovie("__Packages.mycustommc", "mycustommc1", getNextHighestDepth());
it1.move(100, 100);
it2 = attachMovie("__Packages.mycustommc", "mycustommc2", getNextHighestDepth());
it2.move(300, 100);