Window of calcultion's property is added

StructureHelperLogics/Models/Calculations/CalculationProperties/IForceCombination.cs

@@ -0,0 +1,13 @@
+using LoaderCalculator.Data.Matrix;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace StructureHelperLogics.Models.Calculations.CalculationProperties
+{
+    public interface IForceCombination
+    {
+        IForceMatrix ForceMatrix { get; }
+        bool TakeInCalculate { get; set; }
+    }
+}