- (void) windowDidEnterFullScreen:(NSNotification*) notification
{
    NSWindow* window = [self window];

    NSRect mainDisplayRect = [[NSScreen mainScreen] frame];
    [window setStyleMask:NSBorderlessWindowMask];
    [window setContentSize:mainDisplayRect.size];
    [window setLevel:NSMainMenuWindowLevel + 1];
    [window makeKeyAndOrderFront:self];

    NSRect windowFrame = [window frame];
    windowFrame.origin.x = 0;
    windowFrame.origin.y = 0;
    [window setFrame:windowFrame display:YES];
}