diff --git a/API_Nesting.cpp b/API_Nesting.cpp
index 1e26cb8..1eb111b 100644
--- a/API_Nesting.cpp
+++ b/API_Nesting.cpp
@@ -33,6 +33,13 @@ __stdcall EgtAdjustFlatPartLayer( int nLayerId)
    return ( ExeAdjustFlatPartLayer( nLayerId) ? TRUE : FALSE) ;
 }
 
+//-----------------------------------------------------------------------------
+BOOL
+__stdcall EgtCalcFlatPartUpRegion( int nPartId, BOOL bCalc)
+{
+   return ( ExeCalcFlatPartUpRegion( nPartId, ( bCalc != FALSE)) ? TRUE : FALSE) ;
+}
+
 //-----------------------------------------------------------------------------
 BOOL
 __stdcall EgtCalcFlatPartDownRegion( int nPartId, double dH)
diff --git a/EgtInterface.rc b/EgtInterface.rc
index 98663e3..958d2e1 100644
Binary files a/EgtInterface.rc and b/EgtInterface.rc differ