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crash on custom NSWindow subclass dealloc



I have a custom subclass of NSWindow that I've defined a dealloc
method for as so:

- (void)dealloc
{
	[ogl_view release];
	NSZoneFree([self zone], [self zone]);
	[super dealloc];
}

Things work fine until the program hits "[super dealloc];".  At that
point, I get a crash every time and the stack looks like this:

#0	0x0181b028 in ??
#1	0x900052ef in free
#2	0x9080dfc0 in CFRelease
#3	0x932aeabe in -[NSWindow _setWindowNumber:]
#4	0x9333d0da in -[NSWindow _termWindowIfOwner]
#5	0x9333c2c5 in -[NSWindow dealloc]
#6	0x004386bb in -[CocoaOpenGLWin dealloc] at cocoa_opengl_win.m:51


I'm not sure what's going on at all.  What are the mechanics of
deallocating a custom NSWindow subclass?  I feel I'm missing something
crucial here because even when I pare the class down to almost
nothing, it still crashes.

thanks,
wes
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