code: function initContextMenuContainer(params) {
            // Destructuring
            var customClass = params.customClass;
  
            var $ul = $('<ul>');
            $ul.addClass('dropdown-menu');
            $ul.attr({ 'role': 'menu' });
            $ul.css({
              display: 'block',
              position: 'absolute',
              left: params.event.pageX + 'px',
              top: params.event.pageY + 'px',
              'z-index': 10000
            });
  
            if(customClass) { $ul.addClass(customClass); }
  
            return $ul;
          }
docs: Creates the container of the context menu (a <ul> element),
  applies the appropriate styles and then returns that container
  
  @return a <ul> jqLite/jQuery element