[MrPoma]

picture_mc.onPress = function(){
       var rect:flash.geom.Rectangle = new flash.geom.Rectangle();
       rect.x = container._width - this._width;
       rect.y = container._height - this._height;
       rect.width = this._width - container._width;
       rect.height = this._height - container._height;
       this.startDrag(false, rect.x, rect.y, rect.width, rect.height);
}

картинка в picture_mc отцентрована по левому верхнему углу