I'm again struggling with setting NSViews background colors to transparent. I have a `NSCollectionView` as part of `NSClipView` which is part of a `NSScrollview`. My `MainViewController` has an outlet to the `collectionView`. With adding the two lines of code and after compiling the background is sometimes transparent but most of the times not:

```
view.wantsLayer = true
collectionView.layer?.backgroundColor = NSColor.clear.cgColor

```

I also tried to select/de-select the "Draw Background" property of the `NSScrollView` in the IB without any effects.
What do I miss here.