http://bugs.winehq.org/show_bug.cgi?id=12059
--- Comment #4 from Jeff Zaroyko jeffzaroyko@gmail.com 2008-09-11 21:24:02 --- (In reply to comment #3)
This bug remains unchanged as of Wine 1.1.4 and FL Studio version 8. I guess what seems the most puzzling is how Wine would create any window that does not have a close button.
It's not all that puzzling, the styles specified for a window dictate things like that. I haven't really looked at this bug properly, but adding the WS_SYSMENU style to dwStyles before the window is created gives a working X. I might look at why this is happening and send a proper patch soon.