code: function (parent, el) {
          var id = el.id,
              children = parent.children,
              items = this.items;
  
          if(children) {
              Ext.Array.remove(children, items[id]);
          }
          delete items[id];
      }
docs: Removes the ContextItem for an element from the cache and from the parent's
  "children" array.
  @param {Ext.layout.ContextItem} parent
  @param {Ext.dom.Element} el