override func drawRect(rect: NSRect) {
    super.drawRect(rect)
    NSColor(calibratedWhite: 0.1, alpha: 1).setFill()
    NSRectFill(rect)

    let mbFrame = NSMakeRect(
        rect.size.width / 2 - (45 / 2),
        8,
        49,
        49
    )
    mainBtn.frame = mbFrame
}

override func resizeSubviewsWithOldSize(oldSize: NSSize) {
    let mbFrame = NSMakeRect(
        self.frame.size.width / 2 - (45 / 2),
        8,
        49,
        49
    )
    mainBtn.frame = mbFrame
}

override func drawRect(rect: NSRect) {
    super.drawRect(rect)
    NSColor(calibratedWhite: 0.1, alpha: 1).setFill()
    NSRectFill(rect)
}