I've got custom dialog windows working when I'm signed in, but not when I'm signed out.

I've managed to get them to open by adding the ccm.dialog js and css files, but I get an error when I try to close them:

>> obj is undefined

I've tried adding various js files which are present when I'm signed in, but no luck. Can anyone tell me what component is missing? This really needs to be better documented.

Thanks for your time