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The Collaboration windows has (as every other window in NB) the small "x" in top right corner to close the window and when you hover over it it shows "Close button". Now, when you have the "Collaboration Login" window open there is actually a button called "Close" at the bottom there. But the meaning of the two close buttons is totally different: the later would better be called "Switch to Sessions" or something similar.
Reassigning to issues@collab. Collab Support plugin is not actively maintained. Obsoleted in 6.7 by the newly introduced integration with Project Kenai, a collaborative environment for developers to host their open-source projects, which includes also a chat service.
This bug was reported against NetBeans IDE 6.0 or an older release, or against a non-maintained module. NetBeans team does not have enough resources to get to this issue, therefore we are closing the issue as a WONTFIX. If you are interested in providing a patch for this bug, please see our NetFIX guidelines for how to proceed. We apologize for any inconvenience. Thank you. The NetBeans Team