diff --git a/EGkSurfFlatRegion.h b/EGkSurfFlatRegion.h
index b076359..eee5e43 100644
--- a/EGkSurfFlatRegion.h
+++ b/EGkSurfFlatRegion.h
@@ -52,6 +52,10 @@ class __declspec( novtable) ISurfFlatRegion : public ISurf
       virtual bool CalcVoronoiDiagram( ICURVEPOVECTOR& vCrvs, int nBound = 3) const = 0 ;
       virtual bool CalcMedialAxis( ICURVEPOVECTOR& vCrvs, int nSide = 1) const = 0 ;
       virtual void ResetVoronoiObject( void) const = 0 ;
+      virtual bool SetCurveTempProp( int nChunk, int nLoop, int nCrv, int nProp, int nPropInd = 0) = 0 ;
+      virtual bool GetCurveTempProp( int nChunk, int nLoop, int nCrv, int& nProp, int nPropInd = 0) const = 0 ;
+      virtual bool SetCurveTempParam( int nChunk, int nLoop, int nCrv, double dParam, int nParamInd = 0) = 0 ;
+      virtual bool GetCurveTempParam( int nChunk, int nLoop, int nCrv, double& dParam, int nParamInd = 0) const = 0 ;
 } ;
 
 //-----------------------------------------------------------------------------