FormField's applyTo and Form validation

[cmd.ares]

the "forms.html" in ext forms example has not validation.

I try to add form validation but is missing.

I don't konw if the "applyTo" method conflect with form.isValid().
---my js code---

var myForm = new Ext.form.Form({
url:'http://localhost:8080/test/DemoServlet',
method:'post',
listeners: {
'actioncomplete': function(form, action){
var data = action.result;
Ext.MessageBox.alert('xxx','xxx'+data.data);
},
'actionfailed': function(form,action){alert('post failure')}
},
waitMsg:'Searching...'
});

var alpha2 = new Ext.form.TextField({
allowBlank:false,
vtype:'alpha',
disableKeyFilter:true
});
alpha2.applyTo('txt');
var date2 = new Ext.form.DateField({
allowBlank:false,
format:'Ymd'
});
date2.applyTo('date2');

myForm.add(alpha2,alpha2);
myForm.render('form1');
Ext.get("btn").on("click",function(){
if (myForm.isValid()){
//myForm.submit();
Ext.MessageBox.alert('isValid','success');
}
});

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[rqmedes]

Has quick tips been initialised?

Ext.QuickTips.init();