Index: src/DeltaShell/DeltaShell.Plugins.SharpMapGis.Gui/Commands/MapZoomPreviousCommand.cs
===================================================================
diff -u -r8f6ae890fed8e8eae3a32f9c0498a10f82e0ddf9 -r5fc71a385897af92ccb092f2f969b5709afab85a
--- src/DeltaShell/DeltaShell.Plugins.SharpMapGis.Gui/Commands/MapZoomPreviousCommand.cs	(.../MapZoomPreviousCommand.cs)	(revision 8f6ae890fed8e8eae3a32f9c0498a10f82e0ddf9)
+++ src/DeltaShell/DeltaShell.Plugins.SharpMapGis.Gui/Commands/MapZoomPreviousCommand.cs	(.../MapZoomPreviousCommand.cs)	(revision 5fc71a385897af92ccb092f2f969b5709afab85a)
@@ -2,25 +2,25 @@
 {
     public class MapZoomPreviousCommand : MapZoomHistoryCommand
     {
-        protected override void OnExecute(params object[] arguments)
-        {
-            ZoomHistoryToolMapTool.PreviousZoomState();
-            MapView.MapControl.Refresh();
-
-            base.OnExecute(arguments);
-        }
-
         public override bool Enabled
         {
             get
             {
-                if(MapView == null)
+                if (MapView == null)
                 {
                     return false;
                 }
 
                 return ZoomHistoryToolMapTool.UndoCount > 0;
             }
         }
+
+        protected override void OnExecute(params object[] arguments)
+        {
+            ZoomHistoryToolMapTool.PreviousZoomState();
+            MapView.MapControl.Refresh();
+
+            base.OnExecute(arguments);
+        }
     }
 }
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