How to make dock icon clicks reopen your application.

gistfile1.txt

- (BOOL)applicationShouldHandleReopen:(NSApplication *)sender hasVisibleWindows:(BOOL)visibleWindows
{
    if (!visibleWindows)
    {
        // do what ever here to reopen your window
        [[CoverStoryDocumentController sharedDocumentController] openDocument:self];
        return NO;
    }
    return YES;
}