package  {
  import flash.display.Sprite;
  
  public class ProjectList extends Sprite {
    private var _mask:Sprite;
    private var _container:Sprite;
    private var _buttonSpacing:Number;
    private var _maximum_y:Number
    public function ProjectList() {
      this._mask = new Sprite();
      this._container = new Sprite();
      this._buttonSpacing = 5;
      this._maximum_y = 0;
 
      addChild(this._mask);
      addChild(this._container);
    } 
 
    public function addButton(options:Object):PickleButton {
      var button:PickleButton = new PickleButton(options);
      
      this._container.addChild(button)
      this.positionButton(button);
 
      this._maximum_y = button.y + button.height;
 
      trace(button.y);
      return button;
    }
 
    private function positionButton(button:PickleButton):void {
      button.y = this._maximum_y + this._buttonSpacing;
    }
  }
}