if(Ext.form.VTypes){
  Ext.apply(Ext.form.VTypes, {
    emailText    : 'This field should be an e-mail address in the format "user@example.com"',
    urlText      : 'This field should be a URL in the format "http:/'+'/www.example.com"',
    alphaText    : 'This field should only contain letters and _',