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    <p>When you press <kbd>Command</kbd> + <kbd>W</kbd>, it's the exact same as choosing <code>File -&gt; Close</code> from the menu bar. What <code>Close</code> does is send a <a href="http://developer.apple.com/documentation/Cocoa/Reference/ApplicationKit/Classes/NSWindow_Class/Reference/Reference.html#//apple_ref/occ/instm/NSWindow/performClose:" rel="noreferrer"><code>performClose:</code></a> message to the first responder. That, in turn, will check if the receiver or if the receiver's delegate implements <a href="http://developer.apple.com/documentation/Cocoa/Reference/ApplicationKit/Classes/NSWindow_Class/Reference/Reference.html#//apple_ref/occ/instm/NSObject/windowShouldClose:" rel="noreferrer"><code>windowShouldClose:</code></a>, and the window will close if it returns <code>YES</code> (otherwise, it will call the <code>close</code> method).</p> <p>So really, it depends on what type of dialog you've got here. If it's non-modal (essentially, if you can access the menu bar while it's running) and is an instance or subclass of <code>NSWindow</code>, then all you need to do is override the <code>windowShouldClose:</code> method in your dialog's delegate (or your dialog class, if you subclassed <code>NSWindow</code> or something) and make it return <code>YES</code>.</p> <p><strong>However</strong>, if the dialog is a modal dialog (you can't access the menu bar, switch windows, etc. while the dialog is running), then you can't do it this way. You <em>could</em> add an invisible button, but in all honesty, a modal dialog should not be closed by hitting <code>Command-W</code>, for that most certainly violates some Apple interface guideline out there. (Especially since, as Ande noted, it's standard practice to have <kbd>Esc</kbd> close/cancel a dialog.)</p>
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    1. POHow to make a keyboard shortcut to close dialog with Xcode/Interface Builder?
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    1. COIt is an instance of NSWindow. What you suggest makes sense but when I override windowShouldClose: in the delegate that method is not called when Command-W is pressed. I tried overriding performKeyEquivalent: but that doesn't get called either. Any key I press (except Command-Q which quits the whole application) just beeps.
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    2. COThat sounds like your dialog is modal—in other words, the rest of the interface is disabled while the dialog is running. In this case, you can't (and shouldn't) try to make Command-W close the dialog. You should instead add a "Cancel" button which would map to Esc and/or Command-Period. This is more in line with expected behavior and established interface guidelines.
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    3. CONo, it's modeless. I have a few dialogs, but to pick one specific example, the About dialog. Like in Xcode itself, the About box is modeless, and I'd like to be able to dismiss it with Command-W, as in Xcode.
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