When I saw the following [NSApp beginSheet:mySheet modalForWindow:mainWindow modalDelegate:nil didEndSelector:nil contextInfo:nil]; My sheet pops right up. But when I click my button on the sheet, which is wired up to a dimiss method, nothing I seem to do makes the sheet go away. Does anyone know how to dismiss sheets? (I tried, [NSApp endSheet:mySheet] but that doesn’t seem to help)

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Did you try

[NSApp endSheet:mySheet]; [mySheet orderOut:nil]