diff --git a/EGkCurveComposite.h b/EGkCurveComposite.h
index 7b3eab2..b28d062 100644
--- a/EGkCurveComposite.h
+++ b/EGkCurveComposite.h
@@ -58,8 +58,8 @@ class __declspec( novtable) ICurveComposite : public ICurve
       virtual bool IsAPoint( void) const = 0 ;
       virtual bool IsALine( double dLinTol, Point3d& ptStart, Point3d& ptEnd) const = 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 ;
+      virtual bool SetCurveTempProp( int nCrv, int nProp, int nPropNum = 0) = 0 ;
+      virtual bool GetCurveTempProp( int nCrv, int& nProp, int nPropNum = 0) const = 0 ;
 } ;
 
 //-----------------------------------------------------------------------------
diff --git a/EGkGeoObj.h b/EGkGeoObj.h
index 716af3a..8b324f1 100644
--- a/EGkGeoObj.h
+++ b/EGkGeoObj.h
@@ -53,8 +53,8 @@ class __declspec( novtable) IGeoObj
       virtual void SetObjGraphics( IObjGraphics* pOGr) = 0 ;
       virtual IObjGraphics* GetObjGraphics( void) = 0 ;
       virtual const IObjGraphics* GetObjGraphics( void) const = 0 ;
-      virtual void SetTempProp( int nProp) = 0 ;
-      virtual int  GetTempProp( void) const = 0 ;
+      virtual void SetTempProp( int nProp, int nPropNum = 0) = 0 ;
+      virtual int  GetTempProp( int nPropNum = 0) const = 0 ;
 } ;
 
 //-----------------------------------------------------------------------------