Hi, All,

I'm rather new in Cocoa development, so I have some misunderstanding after API manuals reading. In particular I have a popup panel, opened by a button click in the main window:

- (IBAction) btnClick:(id)sender {
 [popupPanel showWindow];
}

I'd like to launch some process (no matter what exactly, it will work in different thread) as soon this popup panel will appear on screen. Of course, I could launch this process from within the same click handler above, but I believe it will be better to do it all in the WindowController's module, related to the popup panel. My question is: what window delegate message should I use? Will it be OK to use windowDidBecomeKey message or should I use windowDidExposed? Or whatever else?

Another question is what notification could I use to display an alert box, appearing _after_ this popup window will disappear from screen? For example, I have a "Cancel" button on this popup panel, which should terminate the launched process and (as a result of NSTask termination notification) panel should be closed. For the sake of simplicity let's imagin, we're closing the panel by button directly:

- (IBAction) btnCancelClick:(id)sender {
 [[self window] close];
}

My question is: what window delegate message should I use to show an NSAlert, in order my alert box would appear on screen already _after_ hiding of the popup panel? As far as I can see, there is no windowDidClosed message, but there is only windowWillClose. Is there any easy solution here?

Thanks in advance.

Best regards,
Alexander
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