TActiveMultiView is the active counterpart to the original TMultiView control.
TActiveMultiView serves as a container for a group of TView controls, which can be retrieved by the Views property. Each view contains child controls. TActiveMultiView determines which view and its child controls are visible. At any time, at most one view is visible (called active). To make a view active, set ActiveView or ActiveViewIndex. Note, by default there is no active view.
TActiveMultiView is able to render itself on Callback when ActiveView or ActiveViewIndex properties are changed.