code: function setupScrollbarCornerDOM(destroy) {
                      if(!destroy) {
                           _scrollbarCornerElement = FRAMEWORK(generateDiv(_classNameScrollbarCorner));
                          _hostElement.append(_scrollbarCornerElement);
                      }
                      else {
                          remove(_scrollbarCornerElement);
                      }
                   }
docs: ==== Scrollbar Corner ====// 
  Builds or destroys the scrollbar corner DOM element.
  @param destroy Indicates whether the DOM shall be build or destroyed.