diff --git a/EXE_GdbObjAttribs.cpp b/EXE_GdbObjAttribs.cpp
index ed17f36..962a435 100644
--- a/EXE_GdbObjAttribs.cpp
+++ b/EXE_GdbObjAttribs.cpp
@@ -38,13 +38,56 @@ ExeCopyAttributes( int nSouId, int nDestId)
 
 //-----------------------------------------------------------------------------
 bool
-ExeSetLevel( int nId, int nLevel)
+ExeSetLevel( const INTVECTOR& vIds, int nLevel)
 {
    IGeomDB* pGeomDB = GetCurrGeomDB() ;
    VERIFY_GEOMDB( pGeomDB, false)
-  // imposto il livello
-   bool bOk = pGeomDB->SetLevel( nId, nLevel) ;
+  // recupero pezzo e layer correnti
+   bool bCurrPartOff = false ;
+   bool bCurrLayerOff = false ;
+   int nCurrPartId = ExeGetCurrPart() ;
+   int nCurrLayerId = ExeGetCurrLayer() ;
+  // ciclo sul vettore degli identificativi
+   bool bOk = true ;
+   for ( int i = 0 ; i < ssize( vIds) && bOk ; ++ i) {
+     // impostazione livello
+      int nId = (( vIds[i] != GDB_ID_SEL) ? vIds[i] : pGeomDB->GetFirstSelectedObj()) ;
+      while ( nId != GDB_ID_NULL) {
+        // imposto il livello
+         if ( ! pGeomDB->SetLevel( nId, nLevel))
+            bOk = false ;
+        // se nascosto pezzo corrente o layer corrente
+         if ( nLevel != GDB_LV_USER) {
+            if ( nId == nCurrPartId)
+               bCurrPartOff = true ;
+            else if ( nId == nCurrLayerId)
+               bCurrLayerOff = true ;
+         }
+        // passo al successivo
+         nId = (( vIds[i] != GDB_ID_SEL) ? GDB_ID_NULL : pGeomDB->GetNextSelectedObj()) ;
+      }
+   }
+  // se pezzo o layer correnti da rideterminare
+   bool bPrevCmdLog = SetCmdLog( false) ;
+   if ( bCurrPartOff)
+      ExeResetCurrPartLayer() ;
+   else if ( bCurrLayerOff)
+      ExeSetCurrPartLayer( nCurrPartId, ExeGetFirstLayer( nCurrPartId, true)) ;
+   SetCmdLog( bPrevCmdLog) ;
+  // dichiaro progetto modificato
    ExeSetModified() ;
+  // se richiesto, salvo il comando Lua equivalente
+   if ( IsCmdLog()) {
+      string sLevel = "GDB_LV.USER" ;
+      if ( nLevel == GDB_LV_SYSTEM)
+         sLevel = "GDB_LV.SYSTEM" ;
+      else if ( nLevel == GDB_LV_TEMP)
+         sLevel = "GDB_LV.TEMP" ;
+      string sLua = "EgtSetLevel({" + IdListToString( vIds) + "}," +
+                                      sLevel + ")" +
+                    " -- Ok=" + ToString( bOk) ;
+      LOG_INFO( GetCmdLogger(), sLua.c_str()) ;
+   }
    return bOk ;
 }
 
@@ -88,13 +131,56 @@ ExeGetCalcLevel( int nId, int* pnLevel)
 
 //-----------------------------------------------------------------------------
 bool
-ExeSetMode( int nId, int nMode)
+ExeSetMode( const INTVECTOR& vIds, int nMode)
 {
    IGeomDB* pGeomDB = GetCurrGeomDB() ;
    VERIFY_GEOMDB( pGeomDB, false)
-  // imposto il modo
-   bool bOk = pGeomDB->SetMode( nId, nMode) ;
+  // recupero pezzo e layer correnti
+   bool bCurrPartOff = false ;
+   bool bCurrLayerOff = false ;
+   int nCurrPartId = ExeGetCurrPart() ;
+   int nCurrLayerId = ExeGetCurrLayer() ;
+  // ciclo sul vettore degli identificativi
+   bool bOk = true ;
+   for ( int i = 0 ; i < ssize( vIds) && bOk ; ++ i) {
+     // impostazione livello
+      int nId = (( vIds[i] != GDB_ID_SEL) ? vIds[i] : pGeomDB->GetFirstSelectedObj()) ;
+      while ( nId != GDB_ID_NULL) {
+        // imposto il modo
+         if ( ! pGeomDB->SetMode( nId, nMode))
+            bOk = false ;
+        // se nascosto pezzo corrente o layer corrente
+         if ( nMode != GDB_MD_STD) {
+            if ( nId == nCurrPartId)
+               bCurrPartOff = true ;
+            else if ( nId == nCurrLayerId)
+               bCurrLayerOff = true ;
+         }
+        // passo al successivo
+         nId = (( vIds[i] != GDB_ID_SEL) ? GDB_ID_NULL : pGeomDB->GetNextSelectedObj()) ;
+      }
+   }
+  // se pezzo o layer correnti da rideterminare
+   bool bPrevCmdLog = SetCmdLog( false) ;
+   if ( bCurrPartOff)
+      ExeResetCurrPartLayer() ;
+   else if ( bCurrLayerOff)
+      ExeSetCurrPartLayer( nCurrPartId, ExeGetFirstLayer( nCurrPartId, true)) ;
+   SetCmdLog( bPrevCmdLog) ;
+  // dichiaro progetto modificato
    ExeSetModified() ;
+  // se richiesto, salvo il comando Lua equivalente
+   if ( IsCmdLog()) {
+      string sMode = "GDB_MD.STD" ;
+      if ( nMode == GDB_MD_LOCKED)
+         sMode = "GDB_MD.LOCKED" ;
+      else if ( nMode == GDB_MD_HIDDEN)
+         sMode = "GDB_MD.HIDDEN" ;
+      string sLua = "EgtSetMode({" + IdListToString( vIds) + "}," +
+                                     sMode + ")" +
+                    " -- Ok=" + ToString( bOk) ;
+      LOG_INFO( GetCmdLogger(), sLua.c_str()) ;
+   }
    return bOk ;
 }
 
@@ -149,11 +235,11 @@ ExeSetStatus( const INTVECTOR& vIds, int nStat)
    int nCurrLayerId = ExeGetCurrLayer() ;
   // ciclo sul vettore degli identificativi
    bool bOk = true ;
-   for ( size_t i = 0 ; i < vIds.size() && bOk ; ++ i) {
+   for ( int i = 0 ; i < ssize( vIds) && bOk ; ++ i) {
      // impostazione stato
       int nId = (( vIds[i] != GDB_ID_SEL) ? vIds[i] : pGeomDB->GetFirstSelectedObj()) ;
       while ( nId != GDB_ID_NULL) {
-        // imposto il modo
+        // imposto lo stato
          if ( ! pGeomDB->SetStatus( nId, nStat))
             bOk = false ;
         // se nascosto pezzo corrente o layer corrente
diff --git a/EgtExecutor.rc b/EgtExecutor.rc
index 01e79d7..0ade074 100644
Binary files a/EgtExecutor.rc and b/EgtExecutor.rc differ
diff --git a/EgtExecutor.vcxproj b/EgtExecutor.vcxproj
index 241f4cb..8c74b69 100644
--- a/EgtExecutor.vcxproj
+++ b/EgtExecutor.vcxproj
@@ -105,7 +105,7 @@
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
       <MinimalRebuild>false</MinimalRebuild>
       <OpenMPSupport>false</OpenMPSupport>
-      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard>stdcpp20</LanguageStandard>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
@@ -131,7 +131,7 @@ copy $(TargetPath) \EgtProg\DllD32</Command>
       <OmitFramePointers>false</OmitFramePointers>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
       <MinimalRebuild>false</MinimalRebuild>
-      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard>stdcpp20</LanguageStandard>
       <AdditionalOptions>-Wno-tautological-undefined-compare</AdditionalOptions>
     </ClCompile>
     <Link>
@@ -166,7 +166,7 @@ copy $(TargetPath) \EgtProg\DllD64</Command>
       <EnableEnhancedInstructionSet>StreamingSIMDExtensions2</EnableEnhancedInstructionSet>
       <EnableFiberSafeOptimizations>true</EnableFiberSafeOptimizations>
       <EnableParallelCodeGeneration>true</EnableParallelCodeGeneration>
-      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard>stdcpp20</LanguageStandard>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
@@ -201,7 +201,7 @@ copy $(TargetPath) \EgtProg\Dll32</Command>
       <EnableFiberSafeOptimizations>false</EnableFiberSafeOptimizations>
       <EnableParallelCodeGeneration>true</EnableParallelCodeGeneration>
       <EnableEnhancedInstructionSet>NotSet</EnableEnhancedInstructionSet>
-      <LanguageStandard>stdcpp17</LanguageStandard>
+      <LanguageStandard>stdcpp20</LanguageStandard>
       <AdditionalOptions>-Wno-tautological-undefined-compare</AdditionalOptions>
     </ClCompile>
     <Link>
diff --git a/LUA_GdbObjAttribs.cpp b/LUA_GdbObjAttribs.cpp
index 99bc667..9b83f50 100644
--- a/LUA_GdbObjAttribs.cpp
+++ b/LUA_GdbObjAttribs.cpp
@@ -42,13 +42,13 @@ LuaCopyAttributes( lua_State* L)
 static int
 LuaSetLevel( lua_State* L)
 {
-  // 2 parametri : nId, nLevel
-   int nId ;
-   LuaCheckParam( L, 1, nId)
+  // 2 parametri : Ids, nLevel
+   INTVECTOR vId ;
+   LuaCheckParam( L, 1, vId)
    int nLevel ;
    LuaCheckParam( L, 2, nLevel)
   // imposto lo stato
-   bool bOk = ExeSetLevel( nId, nLevel) ;
+   bool bOk = ExeSetLevel( vId, nLevel) ;
   // restituisco il risultato
    LuaSetParam( L, bOk) ;
    return 1 ;
@@ -111,14 +111,14 @@ LuaGetCalcLevel( lua_State* L)
 static int
 LuaSetMode( lua_State* L)
 {
-  // 2 parametri : nId, nMode
-   int nId ;
-   LuaCheckParam( L, 1, nId)
+  // 2 parametri : Ids, nMode
+   INTVECTOR vId ;
+   LuaCheckParam( L, 1, vId)
    int nMode ;
    LuaCheckParam( L, 2, nMode)
    LuaClearStack( L) ;
   // imposto il modo
-   bool bOk = ExeSetMode( nId, nMode) ;
+   bool bOk = ExeSetMode( vId, nMode) ;
   // restituisco il risultato
    LuaSetParam( L, bOk) ;
    return 1 ;
@@ -179,7 +179,7 @@ LuaGetCalcMode( lua_State* L)
 static int
 LuaSetStatus( lua_State* L)
 {
-  // 2 parametri : Id, nStatus
+  // 2 parametri : Ids, nStatus
    INTVECTOR vId ;
    LuaCheckParam( L, 1, vId)
    int nStatus ;