Themeswitcher – Unpublished themes

I’m not following here.. What makes a theme unpublished? Is there something you can set/clear? And if I do set something, can I test it without users seeing it?

I have uploaded 2 themes and they are both active as soon as you upload them.
I would like to work on a new theme before the users see it, but can’t unless I upload it.. Sounds like catch21.

themeswitcher code follows:
// Don’t let people peek at unpublished themes.
if (isset($theme[‘Status’]) && $theme[‘Status’] != ‘publish’)
return $template;

Thanks for any help.