JooseX triggers on attributes in before/after for class in initialize

gistfile1.js

    initialize : function ( props ) {
      var self = this;

      var triggerCallback = function ( newValue, oldValue ) {
                              var attribute = this;
                              if ( !attribute.isChanged ) {
                                attribute.isChanged = newValue != oldValue;
                              }
                            }

      for (var key in self.meta.attributes ) {
        var attribute = self.meta.attributes[key];
        if ( attribute.is.indexOf('p') != -1 && 
             attribute.writeable ) {

          attribute.isChanged  = false;
          attribute.trigger    = triggerCallback;

        }
      }

    } //- end #initialize