View hierarchy problem

[Andreas Höschler]

Hello all,

I have an application with a shelf view that has a bunch of subviews 
(icons representing applications). In windowDidBecomeKey: I reload the 
shelf, meaning that I do removeFromSuperviewWithoutNeedingDisplay for 
all these subviews and then rebuild the shelf (recreate all the 
subviews). Doubleclicking on one of these subviews launches or 
activates the represented application.

From time to time I get a core dump when doubleclicking from one app to 
the next on the shelf. By backtracing I found out that

        [NSWindow makeFirstResponder:];

is called with a previoulsy removed (and released) view (one of the 
views that have been recreated earlier in windowDidBecomeKey:). Here is 
a pseudo backtrace of this

        [NSWindow makeFistResponder:]  <--------
        [NSWindow sendEvent:];
        [NSApplication sendEvent:]
        [NSApplication run]

I realized some code in [NSView removeSubview:] that is obviously meant 
to remove the to be removed view from teh view hierachy, but it seems 
it is still retained by some event circling around in the event loop 
and then causes the malfunction.

Any idea how this error can be prevented or further tracked down?

Thanks,

  Andreas