Possible Values

Underlay

Drawn before/behind all other layers. Visuals in the underlay layer do not contribute to the size of the parent layer.

Background

Drawn after Underlay and before Layout layer. Visuals in the background layer do not contribute to the size of the parent layer.

Layout

Drawn after the background and before the overlay layer. Visuals in this layer contribute to the size of the parent layer in LayoutControls.

Overlay

Drawn after/on top all other layers. Visuals in the overlay layer do not contribute to the size of the parent layer.