Drawing NSControl when the windows is key or not

I have a NSControl subview and I want to change the drawing when the control is not on a keyWindow. The problem is that I don't see any property that reflects that state (tried enabled property but that was not it).

In simple terms, can I differentiate between these two states?

You can use NSWindow's keyWindow property, and if you want to check to see if your control is the first responder for keyboard events also test [[self window] firstResponder] == self. I don't believe keyWindow supports KVO, but there is a NSWindowDidBecomeKeyNotification and NSWindowDidResignKeyNotification you can listen for. For instance,

- (id)initWithFrame:(NSRect)frameRect;
{
    if ( self = [super initWithFrame:frameRect] )
    {
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(display) name:NSWindowDidResignKeyNotification object:nil];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(display) name:NSWindowDidBecomeKeyNotification object:nil];
    }

    return self;
}

- (void)drawRect:(NSRect)aRect;
{
    if ( [[self window] isKeyWindow] )
    {
    // one way...
    }
    else
    {
    // another way!
    }
}

- (void)dealloc;
{
    [[NSNotificationCenter defaultCenter] removeObserver:self name:NSWindowDidResignKeyNotification object:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:NSWindowDidBecomeKeyNotification object:nil];
    [super dealloc];
}