Read only GroupItem whose children are the root level TimelinerTasks within the DocumentTimeliner document part. Note that each such child may have it's own TimelinerTask children and they in turn may have TimelinerTask children of their own and so on.

Public ReadOnly Property TasksRoot As GroupItem
	Get

public GroupItem TasksRoot { get; }

public:
property GroupItem^ TasksRoot {
	GroupItem^ get ();
}