Arranging Content Around a Central Area: Panel Stretch Layout
As previously mentioned, the panel stretch layout component can automatically stretch its children when it is stretched. However, it does not have any elements that render by themselves. It does have several facets to which you can add content to arrange such content around a central area. The center facet is the central area, and you can display content above, below, to the left, or to the right of it in the top, bottom, start, and end facets.
Although the panel stretch layout component is similar to the panel border layout, it differs in that:
Fewer facets restrict you to a less flexible arrangement of content.
You cannot add direct children. All content must be added to a facet.