[openbeos] BeOS/Haiku UI question

Question got UI gurus.

There is a preferences window with the following four buttons:

# Default
# Cancel
# Done
# Tab close button

Say I open a window, and change one setting. Each button would have the 
following effect:

Default - Resets the settings to the 'factory default'.
Cancel - Closes the window as if I never opened it. The change is lost.
Done - Closes the window and saves/activates the settings.

But what about the tab Close button? Should it have the same effect as 
the Cancel button? Or should it act as the Done button? What is the 
expected behaviour in BeOS/Haiku?

Please advise.

Koki

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