diff --git a/EXE_Scene.cpp b/EXE_Scene.cpp
index 6593242..30f6e59 100644
--- a/EXE_Scene.cpp
+++ b/EXE_Scene.cpp
@@ -431,14 +431,40 @@ ExeGetShowCurveDirection( void)
    return pScene->GetShowCurveDirection() ;
 }
 
+//-----------------------------------------------------------------------------
+static bool
+MyResetGroupObjGraphics( IGeomDB* pGDB, int nGroupId)
+{
+   int nEntId = pGDB->GetFirstInGroup( nGroupId) ;
+   while ( nEntId != GDB_ID_NULL) {
+      if ( pGDB->GetGdbType( nEntId) == GDB_TY_GROUP) {
+         MyResetGroupObjGraphics( pGDB, nEntId) ;
+      }
+      else {
+         IGeoObj* pGeoObj = pGDB->GetGeoObj( nEntId) ;
+         if ( pGeoObj != nullptr)
+            pGeoObj->SetObjGraphics( nullptr) ;
+      }        
+      nEntId = pGDB->GetNext( nEntId) ;
+   }
+   return true ;
+}
+
 //-----------------------------------------------------------------------------
 bool
 ExeSetShowTriaAdv( bool bAdvanced, bool bRedraw)
 {
    IEGrScene* pScene = GetCurrScene() ;
    VERIFY_SCENE( pScene, false)
-  // imposto stato
-   pScene->SetShowTriaAdvanced( bAdvanced) ;
+  // se cambiato, imposto stato
+   if ( pScene->GetShowTriaAdvanced() != bAdvanced) {
+     // imposto il nuovo stato
+      pScene->SetShowTriaAdvanced( bAdvanced) ;
+     // forzo ricalcolo della grafica di tutti gli oggetti
+      IGeomDB* pGDB = pScene->GetGeomDB() ;
+      if ( pGDB != nullptr)
+         MyResetGroupObjGraphics( pGDB, GDB_ID_ROOT) ;
+   }
    if ( bRedraw)
       pScene->RedrawWindow() ;
    return TRUE ;
diff --git a/EgtExecutor.rc b/EgtExecutor.rc
index 2207683..a8e6883 100644
Binary files a/EgtExecutor.rc and b/EgtExecutor.rc differ