Controlling whether shortcode shows login or register template

Hi Everyone,

Is there any way to control whether the TML shortcode outputs the login form or the reigster form?

By default, it shows the login form on a page where I wish it to show the register form.

Both the login/register forms can be shown to a logged out user – how does TML decide which one to use? and how can I control which one it shows by default?

Thanks,
Alex

ps. I tried <?php theme_my_login( 'register_template' ); ?> but it also showed the login form.

https://www.ads-software.com/extend/plugins/theme-my-login/