[Seaside] Adding application to Root Component selector

[ld]

I've started a new application in Seaside and set CanBeRoot to 'true' 
for the class.  Yet, when I go to ..../seaside/config and attempt to add 
an entry point for the app, it is not selectable from the Root Component 
droplist.  How do I get it to appear?

Also:  do my 'seaside' applications need to be created inside the 
'Seaside' catetory? Or can I create my own category and place them there?

-Larry Kelly