diff --git a/OptionPanel/DrawOptionPanel/ManageLayerExpander/LayerTreeView.vb b/OptionPanel/DrawOptionPanel/ManageLayerExpander/LayerTreeView.vb
index 6c4b7ec..7fdbcca 100644
--- a/OptionPanel/DrawOptionPanel/ManageLayerExpander/LayerTreeView.vb
+++ b/OptionPanel/DrawOptionPanel/ManageLayerExpander/LayerTreeView.vb
@@ -69,6 +69,7 @@ Public Class LayerTreeViewItem
          Return m_bOnOff
       End Get
       Set(value As Boolean)
+         If Map.refProjectVM.GetController().GetStep() <> 0 Then Return
          If m_bOnOff <> value Then
             m_bOnOff = value
             ' se abilitato, eseguo operazione