Share Email Facebook Twitter LinkedIn GroupTypeId.CurtainMullionn1 Property Grid 1 Mullions. Namespace: Autodesk.Revit.DBAssembly: RevitAPI (in RevitAPI.dll) Version: 26.4.0.0 (26.4.0.0) Syntax C# public static ForgeTypeId CurtainMullionn1 { get; }Property ValueForgeTypeId See AlsoReferenceGroupTypeId ClassAutodesk.Revit.DB Namespace