ReferencePlane.dll 7b9cac98-fb50-4ecd-a966-da3f0d06a144 Revit.SDK.Samples.ReferencePlane.CS.Command ReferencePlane Allow user to create a reference plane at the left face of the wall or at the bottom of slab which is selected first. AlwaysVisible ADSK Autodesk, www.autodesk.com