[VKS]

Ну примерно так

MyForm = Ext.extend(Ext.form.FormPanel, {
	
	border : false,
	frame : true,
	labelWidth : 120,
	url : 'url',

	,initComponent : function() {

		var config = {

			defaultType : 'textfield',
			defaults : {
				anchor : '-24',
				msgTarget : 'side'
			},
			monitorValid : true,
			autoScroll : true,

			items : [  ],

			buttons : [ {
				text : 'Сохранить',
				iconCls : 'icon-tick',
				formBind : true,
				scope : this,
				handler : this.submit
			}, {
				text : 'Отмена',
				iconCls : 'icon-cross',
				scope : this,
				handler : function() {
					this.fireEvent('chancel');
				}
			} ]
		};

		// apply config
		Ext.apply(this, Ext.apply(this.initialConfig, config));

		// call parent
		MyForm.superclass.initComponent.apply(this, arguments);

		// add custom events
		this.addEvents('saved');
	}

	,onRender : function() {
		// call parent
		MyForm.superclass.onRender.apply(this, arguments);
		this.getForm().waitMsgTarget = this.getEl();
	} // eo onRender

	,submit : function() {
		this.getForm().submit( {
			url : this.url,
			scope : this,
			success : this.onSuccess,
			failure : this.onFailure,
			waitMsg : 'Сохранение данных...'
		});
	} // eo submit

	,onSuccess : function(form, action) {

		var responseObj = Ext.decode(action.response.responseText);

		// send the new record id
		this.fireEvent('saved', responseObj);
	}

	,onFailure : function(form, action) {
		var responseObj = Ext.decode(action.response.responseText);
		this.showError(action.result.error || responseObj.errormsg);
	}

	,showError : function(msg, title) {
		title = title || 'Error';
		Ext.Msg.show( {
			title : title,
			msg : msg,
			modal : true,
			icon : Ext.Msg.ERROR,
			buttons : Ext.Msg.OK
		});
	}

}); // eo extend
// register xtype
Ext.reg('MyForm', MyForm);

И далее где угодно

MyForm.on('saved', function(responseObj) {
// Что делаем			
});