code: function _fieldsChanged(oChanges) {
  
  			if (oChanges.child) {
  				_fieldChanged.call(this, oChanges.child, oChanges.mutation);
  			} else if (oChanges.children) {
  				for (var i = 0; i < oChanges.chlidren.length; i++) {
  					_fieldChanged.call(this, oChanges.children[i], oChanges.mutation);
  				}
  			}
  
  		_updateLabelFor.call(this);
  
  	}
docs: *** Private helper functions ***