code: function repositionResizer(elementSize) {
              var resizerPosition = elementSize || 1;
              if (position === POSITION_RIGHT || position === POSITION_BOTTOM) {
                  $resizer.css(resizerCSSPosition, resizerPosition);
              }
          }
docs: If the resizer is positioned right or bottom of the panel, we need to listen to reposition it if the element size changes externally