How can I make CALayer and all its Zoom sublayers proportional?

I am trying to create an NSScrollView that displays document pages. I added a CALayer controlled NSView as the NSScrollView documentView and then added a CALayer sub-layer to the documentView. When I scale the NSScollview, the DocumentView scales and downscales correctly. However, documentView sublayers do not scale in proportion to their documentView content. If I don't set autoresizingMask on the sublayers of the documentView layer, the sublayers just fly off the screen when the documentView is zoomed in. If I use the LayerWidthSizable / LayerHeightSizable parameters, the sublayers get more or less than they should be relative to the documentView superword. Here is the code I have so far:

Here's an example NSScrollview:

class LayerScrollView: NSScrollView {

    var containerLayer: ContainerLayer!

    override func awakeFromNib() {
        documentView = ContainerLayer(frame: frame)
    }
}

      

        
        
        
      

    

Here is the ContainerLayer (documentView CALayer):

class ContainerLayer: NSView {

    let documentLayer: DocumentLayer = DocumentLayer()

    override init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
        autoresizesSubviews = true
        wantsLayer = true
        layer = CATiledLayer()
        layer?.delegate = self
        layer?.backgroundColor = NSColor.blueColor().CGColor
        layer?.masksToBounds = true
        documentLayer.frame = CGRect(x: frame.width / 4.0, y: frame.height / 4.0, width: frame.width / 2.0, height: frame.height / 2.0)
        documentLayer.delegate = documentLayer
        layer?.addSublayer(documentLayer)
        documentLayer.autoresizingMask = CAAutoresizingMask.LayerWidthSizable | CAAutoresizingMask.LayerHeightSizable
        documentLayer.setNeedsDisplay()
    }

    required init(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func drawLayer(layer: CALayer!, inContext ctx: CGContext!) {
        CGContextSetFillColorWithColor(ctx, NSColor.redColor().CGColor)
        CGContextFillRect(ctx, layer.bounds)
    }
}

      

        
        
        
      

    

And finally, here is the DocumentLayer (sublayers contained in the DocumentLayer):

class DocumentLayer: CALayer {

    override func drawLayer(layer: CALayer!, inContext ctx: CGContext!) {
        CGContextSetFillColorWithColor(ctx, NSColor.redColor().CGColor)
        CGContextFillRect(ctx, layer.bounds)
    }
}

      

        
        
        
      

    

Here is an image illustrating the problem and my desired results:

The blue rectangle is the ContainerLayer, the red rectangle is the DocumentLayer.

I went through numerous tutorials and docs and came up with an empty one. It looks like it should be very simple. What am I missing here?