var Params = function(panel, defaultParams){
  this.panel = panel;
  this.defaultParams = defaultParams;
};

Params.prototype.build = function(){
  var form = this.panel.getForm();
	var options = {};
	if(form.items.length > 0){
	  Ext.apply(options, form.getValues());
	}
	return options;
};

Params.prototype.buildDefault = function(){
  return Ext.apply(Ext.apply({}, this.defaultParams), this.build());
};