Code Snippet for Assigning System Security Rights for Custom Screen.

List<SecurityInfo> securityInfoList = new List<SecurityInfo>();

            SecurityFunction securityFunction = SecurityFunctionSubSystem.Instance.LoadById("OpticalCatgeory");

            if (securityFunction == null)

            {

                SecurityInfo ShapeTyeSecurity = new SecurityInfo();

                ShapeTyeSecurity.FunctionId = "OpticalCatgeory";

                ShapeTyeSecurity.FunctionDescription = "Optical Category";

                ShapeTyeSecurity.SubFunctionId = "ShapeType";

                ShapeTyeSecurity.SubFunctionDescription = "Shape Type";

  }

securityInfoList.Add(ShapeTyeSecurity);

AppExtensibilityContext.AddSecurityPermissions(securityInfoList);