docs: function (event) {
          var location = event.locationInCanvas
  
          var children = this.children
          for (var i = 0, len = children.length; i < len; i++) {
              var item = children[i]
  
              if (item.visible && item.isEnabled) {
                  var local = item.convertToNodeSpace(location)
  
                  var r = item.rect
                  r.origin = ccp(0, 0)
  
                  if (geom.rectContainsPoint(r, local)) {
                      return item
                  }
  
              }
          }
  
          return null
      }