code: function (ctrl) {
          var self = this, i = self.length;
  
          while (i--) {
            if (self[i] === ctrl) {
              break;
            }
          }
  
          return i;
        }
docs: Finds the index of the specified control or return -1 if it isn't in the collection.
  
  @method indexOf
  @param {Control} ctrl Control instance to look for.
  @return {Number} Index of the specified control or -1.