True if the corresponding left/upper parts profile are mirrored with respect
to the center line of the hosts to be divided. False if the profile of
left/upper parts are defined directly by the profile family.
Namespace: Autodesk.Revit.DBAssembly: RevitAPI (in RevitAPI.dll) Version: 20.0.0.0 (20.0.0.377)
Since: 2013