docs: function (containerSize) {
              if (!containerSize) {
                  containerSize = this._popupContainer.getClientSize();
              }
              var newHeight = containerSize.height + this._shadows.top + this._shadows.bottom;
              var newWidth = containerSize.width + this._shadows.left + this._shadows.right;
  
              this.setProperty("heightMaximized", newHeight);
              this.setProperty("widthMaximized", newWidth);
              this._onDimensionsChanged(true);
          }