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How Can I Notify DrawRect Method?



i'm assuming this is simple, but i can't solve the problem. at launch
of the application, an NSRect is drawn with a userdefault color:

-=-=-=-=-
- (void)drawRect:(NSRect)rect
	{
	NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
	NSData *colorAsData;
	colorAsData = [defaults objectForKey:@"aColor"];
	NSColor *menuBarColor = [NSKeyedUnarchiver
unarchiveObjectWithData:colorAsData];
	[menuBarColor set];
	NSRectFill([self bounds]);
	}
-=-=-=-=-

that works... but now i want that rect to redraw itself when notified
to do so, but i can't figure out how to notify the NSRect to draw
again... all my NSUserDefaults colorAsData is in place, as well as my
NSNotifications.  it will print to NSLog so i know that notification
is being called, but how do direct that notification to the drawRect
method?

-=-=-=-=-
- (void)awakeFromNib
	{
	[MenuBarWindow setAlphaValue:0.0];
	
	NSNotificationCenter *notificationCenter = [NSNotificationCenter
defaultCenter];
	NSString *changeColorNotification = @"changeColorNotification";
	[notificationCenter addObserver:self selector:@selector(changeColor:)
changeColorNotification object:nil];
	}

- (void)changeColor:(NSNotification *)notification
	{
	NSLog(@"Call drawRect");
	//call "drawRect:(NSRect)rect" method
	}
-=-=-=-=-
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