Add work plane property saving

StructureHelperLogics/Models/CrossSections/ICrossSection.cs

@@ -1,4 +1,5 @@
 using StructureHelperCommon.Infrastructures.Interfaces;
+using StructureHelperCommon.Models.WorkPlanes;
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -10,5 +11,6 @@ namespace StructureHelperLogics.Models.CrossSections
     public interface ICrossSection : ISaveable, ICloneable
     {
         ICrossSectionRepository SectionRepository { get; set; }
+        IWorkPlaneProperty WorkPlaneProperty { get; set; }
     }
 }