This object is capable of splitting the area of a Form object between two adjacent children.
The splitter should be created as a child of a RowForm or a ColForm
container (including Paged/Tabbed extensions).
It makes no sense to add this object to PosForm or TableForm containers.
The splitter automatically arranges itself (vertically or horizontally) depending on the parent children arrangement (Row or Col).
Brothers to both the left and right (top and bottom) should be resizeable
objects.