I have the following `NSView` subclass, which is layer backed, and draws a `CAGradientLayer`. When I call `needsDisplay = true`, I'd expect `updateLayer` to be called, but it isn't. Is my understanding of what should happen incorrect, or have I done something wrong?Thanks,Lukeclass ViewSubclass: NSView { override var wantsUpdateLayer: Bool { return true } init() { super.init(frame: CGRectZero) self.wantsLayer = true self.layerContentsRedrawPolicy = NSViewLayerContentsRedrawPolicy.OnSetNeedsDisplay } required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") } override func makeBackingLayer() -> CALayer { let saturationGradientLayer = CAGradientLayer() saturationGradientLayer.colors = [NSColor.whiteColor().CGColor, NSColor.redColor().CGColor] saturationGradientLayer.locations = [0.0, 1.0] saturationGradientLayer.startPoint = CGPoint(x: 0.0, y: 0.0) saturationGradientLayer.endPoint = CGPoint(x: 1.0, y: 0.0) return saturationGradientLayer } override func updateLayer() { NSLog("Update layer called") }