Defines the layout of the sub containers. The possible values are "Border Layout", "Tabbed Panel", "Accordion", and "Portal".

A Desktop Container with border layout contains at most 5 Containers and at least 1 Container at the first level. The available positions are : top, left, right, bottom, center.

The center position is compulsory.

A Desktop Container with "Tabbed Panel" is a set of containers ranged in tabs.

A Desktop Container with "Accordion" is a set of container ranged in an accordion.