A compound split is a nested split, meaning that the initial C1Splitter control contains one or more C1Splitter controls. A compound split can contain two or more vertical splitters, two or more horizontal splitters, or a combination of vertical and horizontal splitters.
A compound split can be created by directly dropping a child C1Splitter into the panel of the parent C1Splitter.

The most common usage of a compound splitter is full-cover nesting. To create full cover nesting, set the nested splitter control's width or height to 100% to make it fully extend to the size of the parent's panel. The following image illustrates a full-cover nesting in a compound splitter: