A root-level task is defined as one which has no parent task, i.e.it resides in the UltraCalendarInfo's Tasks collection.
A task which does not belong to any TasksCollection always returns false from the IsRoot property, since a task's root status cannot be determined when it does not yet belong to any collection.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2