// Method to set field label text.
Ext.override(Ext.form.Field, {
   setFieldLabel : function(text) {
      if (this.labelSeparator == undefined || this.labelSeparator == null || this.labelSeparator == '' ) {
         this.labelSeparator = ':';
      }
      text = text + this.labelSeparator;
      if (this.rendered) {
         this.el.up('.x-form-item', 10, true).child('.x-form-item-label').update(text);
      }
      this.fieldLabel = text;
   }
})