diff --git a/Controller.vb b/Controller.vb
index c046ea9..440b2b5 100644
--- a/Controller.vb
+++ b/Controller.vb
@@ -91,6 +91,7 @@ Public Class Controller
       POLYGONSIDE
       TEXT
       TEXTPLUS
+      REGION
       PLANE
       EXTRUDE
       REVOLVE
@@ -1057,6 +1058,9 @@ Public Class Controller
       ' Text Plus
       Case CMD.TEXTPLUS
          Return ProcessTextPlus()
+      ' Region
+      Case CMD.REGION
+         Return ProcessRegion()
       ' Plane
       Case CMD.PLANE
          Return ProcessPlane()
@@ -3456,6 +3460,43 @@ Public Class Controller
       End If
    End Sub
 
+   Private Function ProcessRegion() As Boolean
+      If m_nStep <> 0 Then
+         Return False
+      End If
+      ' posso partire solo se esiste un gruppo corrente
+      If GetCurrLayer() = GDB_ID.NULL Then
+         Return False
+      End If
+      ' creo la regione piana (a partire da uno o più contorni selezionati)
+      EnableCommandLog()
+      If EgtGetSelectedObjCount() = 1 Then
+         EgtCreateSurfTmByFlatContour(GetCurrLayer(), EgtGetLastSelectedObj(), EPS_STM)
+      Else
+         ' creo vettore di entità selezionate
+         Dim nCrvNum As Integer = 0
+         Dim nCrvIds(EgtGetSelectedObjCount() - 1) As Integer
+         Dim nId As Integer = EgtGetFirstSelectedObj()
+         While nId <> GDB_ID.NULL
+            Select Case EgtGetType(nId)
+            Case GDB_TY.CRV_LINE, GDB_TY.CRV_ARC, GDB_TY.CRV_BEZ, GDB_TY.CRV_COMPO
+               nCrvIds(nCrvNum) = nId
+               nCrvNum = nCrvNum + 1
+            End Select
+            nId = EgtGetNextSelectedObj()
+         End While
+         ' creo la superficie
+         EgtCreateSurfFlatRegion(GetCurrLayer(), nCrvIds)
+      End If
+      DisableCommandLog()
+      ' reset stato scena
+      m_Scene.ResetStatus()
+      ' reset stato
+      m_nStep = 0
+      RaiseEvent UpdateUI(Me, True)
+      Return True
+   End Function
+
    Private Function ProcessPlane() As Boolean
       If m_nStep <> 0 Then
          Return False
@@ -3482,7 +3523,7 @@ Public Class Controller
             nId = EgtGetNextSelectedObj()
          End While
          ' creo la superficie
-         EgtCreateSurfTmByRegion(GetCurrLayer(), nCrvNum, nCrvIds, EPS_STM)
+         EgtCreateSurfTmByRegion(GetCurrLayer(), nCrvIds, EPS_STM)
       End If
       DisableCommandLog()
       ' reset stato scena
diff --git a/EgtInterface.vb b/EgtInterface.vb
index a6b9f98..2ec0847 100644
--- a/EgtInterface.vb
+++ b/EgtInterface.vb
@@ -2132,6 +2132,20 @@ Public Function EgtCreatePolygonFromSide(ByVal nParentId As Integer, ByVal nNumS
    End If
 End Function
 
+<DllImport(EgtIntDll32, CharSet:=CharSet.Unicode, EntryPoint:="EgtCreateSurfFlatRegion")>
+Private Function EgtCreateSurfFlatRegion_32(ByVal nParentId As Integer, ByVal nNumCrv As Integer, ByVal nCrvId() As Integer) As Integer
+End Function
+<DllImport(EgtIntDll64, CharSet:=CharSet.Unicode, EntryPoint:="EgtCreateSurfFlatRegion")>
+Private Function EgtCreateSurfFlatRegion_64(ByVal nParentId As Integer, ByVal nNumCrv As Integer, ByVal nCrvId() As Integer) As Integer
+End Function
+Public Function EgtCreateSurfFlatRegion(ByVal nParentId As Integer, ByVal nCrvId() As Integer) As Integer
+   If IntPtr.Size = 4 Then
+      Return EgtCreateSurfFlatRegion_32(nParentId, nCrvId.Length(), nCrvId)
+   Else
+      Return EgtCreateSurfFlatRegion_64(nParentId, nCrvId.Length(), nCrvId)
+   End If
+End Function
+
 <DllImport(EgtIntDll32, CharSet:=CharSet.Unicode, EntryPoint:="EgtCreateSurfTmByFlatContour")>
 Private Function EgtCreateSurfTmByFlatContour_32(ByVal nParentId As Integer, ByVal nCrvId As Integer, ByVal dLinTol As Double) As Integer
 End Function
@@ -2152,11 +2166,11 @@ End Function
 <DllImport(EgtIntDll64, CharSet:=CharSet.Unicode, EntryPoint:="EgtCreateSurfTmByRegion")>
 Private Function EgtCreateSurfTmByRegion_64(ByVal nParentId As Integer, ByVal nNumCrv As Integer, ByVal nCrvId() As Integer, ByVal dLinTol As Double) As Integer
 End Function
-Public Function EgtCreateSurfTmByRegion(ByVal nParentId As Integer, ByVal nNumCrv As Integer, ByVal nCrvId() As Integer, ByVal dLinTol As Double) As Integer
+Public Function EgtCreateSurfTmByRegion(ByVal nParentId As Integer, ByVal nCrvId() As Integer, ByVal dLinTol As Double) As Integer
    If IntPtr.Size = 4 Then
-      Return EgtCreateSurfTmByRegion_32(nParentId, nNumCrv, nCrvId, dLinTol)
+      Return EgtCreateSurfTmByRegion_32(nParentId, nCrvId.Length(), nCrvId, dLinTol)
    Else
-      Return EgtCreateSurfTmByRegion_64(nParentId, nNumCrv, nCrvId, dLinTol)
+      Return EgtCreateSurfTmByRegion_64(nParentId, nCrvId.Length(), nCrvId, dLinTol)
    End If
 End Function