code: function (options) {
  		
  			inputEx.DSSelectField.superclass.setOptions.call(this, options);
  		
  			this.options.valueKey = options.valueKey || "value";
  			this.options.labelKey = options.labelKey || "label";
  		
  			this.options.datasource = options.datasource;
  		
  		}
docs: Setup the additional options for selectfield
  @param {Object} options Options object as passed to the constructor