- Measure
- Prepare measureSize from availableSize
- Measure self+children
- Set validated/cleaned response as DesiredSize
- Arrange
- Prepare finalSize from finalRect
- Arrange self+children
- Framework coercion
- Build RenderSize, VisualOffset, LayoutXform, LayoutClip
- Sizing
- Update Actual Size
- Notify SizeChanged for any changed after entire pass done