calls an inner event
| name | string | the event name, case-insensitive | 
| params | array | the array of the event parameters | 
| boolean | false, if some of the event handlers return false. Otherwise, true | 
{
  view:"form",
  elements:[
    { view:"text", name:"fname" },
    {
      view:"button", value:"Add a field", click:function(){
 
        var form = this.getFormView();
        var fields = Object.keys(form.elements).length;
 
        form.addView({
          view:"text",
          name:"field_" + webix.uid()
        },fields);
 
        form.callEvent("onAfterFieldAdded", [ ++fields ]);
      } 
    }
  ]
}
Normally, events are called automatically and you don't need to use this method.