How it works
At the heart of StackView are three layers of embedded ContainerControls.
The top layer is a ContainerControl of type ViewController 3. You design your interface on a ViewController.
Each ViewController is embedded in another ContainerControl of type StackController 2. The StackController is responsible for showing and hiding the embedded ViewControllers and provide a heading as well.
Finally StackControllers are embedded in a ContainerControl of type ScrollController 1 . These deal with scrolling if the shown embedded controls take up more space when is available.
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