Estou tentando criar umNSWindow semBarra de titulo (NSBorderlessWindowMask) com cantos arredondados e uma sombra, semelhante à janela abaixo "Bem-vindo ao Xcode".

Eu faço uma subclasse deNSWindow:

@implementation FlatWindow

- (id)initWithContentRect:(NSRect)contentRect styleMask:(NSUInteger)aStyle backing:(NSBackingStoreType)bufferingType defer:(BOOL)flag
{
    self = [super initWithContentRect:contentRect styleMask:NSBorderlessWindowMask backing:bufferingType defer:flag];

    if ( self )
    {
        [self setOpaque:NO];
        [self setBackgroundColor:[NSColor clearColor]];
        [self setMovableByWindowBackground:TRUE];
        [self setStyleMask:NSBorderlessWindowMask];
        [self setHasShadow:YES];
    }

    return self;
}

- (void) setContentView:(NSView *)aView
{
    aView.wantsLayer            = YES;
    aView.layer.frame           = aView.frame;
    aView.layer.cornerRadius    = 10.0;
    aView.layer.masksToBounds   = YES;

    [super setContentView:aView];
}

@end

E uma subclasse deNSView:

@implementation ColoredView

- (void)drawRect:(NSRect)dirtyRect {
    [super drawRect:dirtyRect];

    [[NSColor windowBackgroundColor] set];
    NSRectFill(dirtyRect);
}

@end

Isso me dá uma janela semBarra de titulo com cantos arredondados, mas a sombra padrãoNSWindow se foi. Como posso adicionar a sombra padrão a esta janela?

EDIT1:

NSWindow comNSShadow. Essa sombra não é mostrada.

@implementation FlatWindow

- (id)initWithContentRect:(NSRect)contentRect styleMask:(NSUInteger)aStyle backing:(NSBackingStoreType)bufferingType defer:(BOOL)flag
{
    self = [super initWithContentRect:contentRect styleMask:NSBorderlessWindowMask backing:bufferingType defer:flag];

    if ( self )
    {
        [self setOpaque:NO];
        [self setBackgroundColor:[NSColor clearColor]];
        [self setMovableByWindowBackground:TRUE];
        [self setStyleMask:NSBorderlessWindowMask];
        [self setHasShadow:YES];
    }

    return self;
}

- (void) setContentView:(NSView *)aView
{
    aView.wantsLayer            = YES;
    aView.layer.frame           = aView.frame;
    aView.layer.cornerRadius    = 10.0;
    aView.layer.masksToBounds   = YES;

    NSShadow *dropShadow = [[NSShadow alloc] init];
    [dropShadow setShadowColor:[NSColor blackColor]];
    [dropShadow setShadowBlurRadius:10.0];
    [aView setShadow: dropShadow];

    [super setContentView:aView];
}

@end