code: function(redraw) {
          var i = 0,
              items = this.items,
              len = this.length;
              
          for (; i < len; i++) {
              items[i].hide(redraw);
          }
          return this;
      }
docs: Hides all sprites. If `true` is passed then a redraw will be forced for each sprite.
  @param {Boolean} redraw Flag to immediately draw the change.
  @return {Ext.draw.CompositeSprite} this