public/javascripts/inputex/js/fields/KeyValueField-beta.js
function() {
      inputEx.KeyValueField.superclass.initEvents.call(this);

      this.inputs[0].updatedEvt.subscribe(this.onSelectFieldChange, this, true); 
   }
function() {
      inputEx.KeyValueField.superclass.initEvents.call(this);

      this.inputs[0].updatedEvt.subscribe(this.onSelectFieldChange, this, true); 
   }
function ( ) { inputEx . KeyValueField . superclass . initEvents . call ( this ) ; this . inputs [ 0 ] . updatedEvt . subscribe ( this . onSelectFieldChange , this , true ) ; }
Subscribe the updatedEvt on the key selector
Subscribe the updatedEvt on the key selector