Index: src/DeltaShell/DeltaShell.Plugins.SharpMapGis.Gui/Commands/MapAddWmsLayerCommand.cs
===================================================================
diff -u -r8f6ae890fed8e8eae3a32f9c0498a10f82e0ddf9 -r5fc71a385897af92ccb092f2f969b5709afab85a
--- src/DeltaShell/DeltaShell.Plugins.SharpMapGis.Gui/Commands/MapAddWmsLayerCommand.cs	(.../MapAddWmsLayerCommand.cs)	(revision 8f6ae890fed8e8eae3a32f9c0498a10f82e0ddf9)
+++ src/DeltaShell/DeltaShell.Plugins.SharpMapGis.Gui/Commands/MapAddWmsLayerCommand.cs	(.../MapAddWmsLayerCommand.cs)	(revision 5fc71a385897af92ccb092f2f969b5709afab85a)
@@ -13,24 +13,17 @@
     {
         private static readonly ILog log = LogManager.GetLogger(typeof(MapLegendView));
 
-        protected override void OnExecute(params object[] arguments)
+        public void AddLayerFromExternalSource(string url)
         {
-            var openUrlDialog = new OpenUrlDialog();
-            openUrlDialog.Url = "http://www2.demis.nl/wms/wms.asp?wms=WorldMap&REQUEST=GetCapabilities";
-
-            if (openUrlDialog.ShowDialog() == DialogResult.OK)
+            if (MapView == null)
             {
-                string url = openUrlDialog.Url;
-                
-                AddLayerFromExternalSource(url);
+                return;
             }
-        }
-
-        public void AddLayerFromExternalSource(string url)
-        {
-            if (MapView == null) return;
             var map = MapView.Data as Map;
-            if (map == null) return;
+            if (map == null)
+            {
+                return;
+            }
 
             try
             {
@@ -51,5 +44,18 @@
                 log.Error(ex.Message, ex);
             }
         }
+
+        protected override void OnExecute(params object[] arguments)
+        {
+            var openUrlDialog = new OpenUrlDialog();
+            openUrlDialog.Url = "http://www2.demis.nl/wms/wms.asp?wms=WorldMap&REQUEST=GetCapabilities";
+
+            if (openUrlDialog.ShowDialog() == DialogResult.OK)
+            {
+                string url = openUrlDialog.Url;
+
+                AddLayerFromExternalSource(url);
+            }
+        }
     }
 }
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