diff --git a/EGkCurveComposite.h b/EGkCurveComposite.h
index 829cd26..753f0a9 100644
--- a/EGkCurveComposite.h
+++ b/EGkCurveComposite.h
@@ -53,6 +53,8 @@ class __declspec( novtable) ICurveComposite : public ICurve
       virtual bool MergeCurves( double dLinTol, double dAngTolDeg, bool bStartEnd = true) = 0 ;
       virtual bool RemoveUndercutOnY( double dLinTol, double dAngTolDeg) = 0 ;
       virtual bool IsACircle( double dLinTol, Point3d& ptCen, Vector3d& vtN, double& dRad, bool& bCCW) const = 0 ;
+      virtual bool SetCurveTempProp( int nCrv, int nProp) = 0 ;
+      virtual bool GetCurveTempProp( int nCrv, int& nProp) const = 0 ;
 } ;
 
 //-----------------------------------------------------------------------------