diff --git a/EXE_GdbCreateSurf.cpp b/EXE_GdbCreateSurf.cpp
index c2d0ba8..76588ba 100644
--- a/EXE_GdbCreateSurf.cpp
+++ b/EXE_GdbCreateSurf.cpp
@@ -1626,7 +1626,7 @@ ExeCreateSurfBezierRational( int nParentId, int nDegU, int nDegV, int nSpanU, in
 
 //-------------------------------------------------------------------------------
 int
-ExeCreateSurfBezierLeaves( int nParentId, int nSurfBzId, int nTextHeight)
+ExeCreateSurfBezierLeaves( int nParentId, int nSurfBzId, int nTextHeight, bool bShowTrim)
 {
    IGeomDB* pGeomDB = GetCurrGeomDB() ;
    VERIFY_GEOMDB( pGeomDB, GDB_ID_NULL)
@@ -1673,6 +1673,9 @@ ExeCreateSurfBezierLeaves( int nParentId, int nSurfBzId, int nTextHeight)
       // inserisco il testo nel DB
       nId = ( bOk ? pGeomDB->AddGeoObj( GDB_ID_NULL, nParentId, Release( pTXT)): GDB_ID_NULL) ;
    }
+   PtrOwner<ISurfFlatRegion> pTrimReg( pSurfBez->GetTrimRegion()->Clone()) ;
+   if ( bShowTrim  &&  ! IsNull( pTrimReg))
+      nId = ( bOk ? pGeomDB->AddGeoObj( GDB_ID_NULL, nParentId, Release( pTrimReg)) : -1 ) ;
 
    return nId ;
 }
diff --git a/LUA_GdbCreateSurf.cpp b/LUA_GdbCreateSurf.cpp
index e89d7d7..19ff3dc 100644
--- a/LUA_GdbCreateSurf.cpp
+++ b/LUA_GdbCreateSurf.cpp
@@ -827,9 +827,11 @@ LuaCreateSurfBezierLeaves( lua_State* L)
    LuaCheckParam( L, 2, nSurfBzId)
    int nTextHeight ;
    LuaCheckParam( L, 3, nTextHeight)
+   bool bShowTrim ;
+   LuaCheckParam( L, 4, bShowTrim)
    LuaClearStack( L) ;
    // creo la superficie
-   int nId = ExeCreateSurfBezierLeaves( nParentId, nSurfBzId, nTextHeight) ;
+   int nId = ExeCreateSurfBezierLeaves( nParentId, nSurfBzId, nTextHeight, bShowTrim) ;
    // restituisco il risultato
    if ( nId != GDB_ID_NULL)
       LuaSetParam( L, nId) ;