How to show validation errors with DMZ

[eluser]The Mask[/eluser]
Hi,
I am in the process of implementing DMZ but how do I show validation errors in my views?

Beforehand, I was using:
<?php echo form_error( 'username' ); ?>

Also, do I need to change how the invalid value entered is shown?
ie <input name="username" value="<?php echo set_value( 'username' ); ?>" />

Thanks