[underW]

ты такое хотел:

Ext.onReady(
		function(){
		 var simple = new Ext.FormPanel({
        frame:true,
       	monitorValid: true,
        title: 'Simple Form',
        width: 350,
        defaults: {width: 230},
        defaultType: 'textfield',
		listeners: {
        clientvalidation : function(form, valid) {
           if(form.getForm().isDirty())
           {console.log("yes")}
        }
     },
        items: [{
                fieldLabel: 'First Name',
                name: 'first',
                allowBlank:false
            }],

        buttons: [{
            text: 'Save'
        },{
            text: 'Cancel'
        }]
    });

    simple.render(document.body);
    
    })