Does not play well with Gmail Hosted (Score 1, Informative)

I have a hosted Gmail solution for my domain, and would have loved to use that account for Google Calendar, but it wasn't letting me do it. The only way to do it was to create a new Google Account using that (already gmail-hosted) email address, and then to create the Google Calendar account. However, doing it this way does not add the Calendar link in the Gmail interface, like it appears in the regular Gmail accounts.