How do I tint an application window like this one?

I am very new to OSX development.

How do I tint an application to dark gray like this one did?

enter image description here

is it possible to do that from interface builder? If not, how do I do that from code?

Solution

To change window title bar color, set the window as textured in IB. Then in corresponding view controller/app delegate update the window color.

NSColor *grayColor = [NSColor colorWithCalibratedRed:64/255.0f
                                               green:64/255.0f
                                                blue:64/255.0f
                                               alpha:1.0];
[self.window setBackgroundColor:grayColor];

Now the window would like this :

enter image description here

With Toolbar:

enter image description here

Note that when window is set as textured entire window will be textured. I have subclassed the view and set background to white color :

- (void)drawRect:(NSRect)dirtyRect
{
    [super drawRect:dirtyRect];
    [[NSColor whiteColor] setFill];
    NSRectFill(dirtyRect);
}

Else the window would like this :

enter image description here