Index: Core/Common/src/Core.Common.Gui/Commands/GuiImportHandler.cs
===================================================================
diff -u -r6271fb4c00844dcf8d401afe9a1b866ef07900d3 -r8e0856bca7d9689c4c09ff2c3008d6cad8c3bef7
--- Core/Common/src/Core.Common.Gui/Commands/GuiImportHandler.cs	(.../GuiImportHandler.cs)	(revision 6271fb4c00844dcf8d401afe9a1b866ef07900d3)
+++ Core/Common/src/Core.Common.Gui/Commands/GuiImportHandler.cs	(.../GuiImportHandler.cs)	(revision 8e0856bca7d9689c4c09ff2c3008d6cad8c3bef7)
@@ -84,7 +84,8 @@
 
             Type targetType = target.GetType();
 
-            return importInfos.Where(info => (info.DataType == targetType || targetType.Implements(info.DataType)) && info.IsEnabled(target));
+            return importInfos.Where(info => (info.DataType == targetType || targetType.Implements(info.DataType))
+                                             && (info.IsEnabled == null || info.IsEnabled(target)));
         }
 
         public void ImportOn(object target, IEnumerable<ImportInfo> supportedImportInfos)
Index: Core/Common/src/Core.Common.Gui/ContextMenu/GuiContextMenuItemFactory.cs
===================================================================
diff -u -rc7fa83c83ff880103fcdb2e87a3756adef4db597 -r8e0856bca7d9689c4c09ff2c3008d6cad8c3bef7
--- Core/Common/src/Core.Common.Gui/ContextMenu/GuiContextMenuItemFactory.cs	(.../GuiContextMenuItemFactory.cs)	(revision c7fa83c83ff880103fcdb2e87a3756adef4db597)
+++ Core/Common/src/Core.Common.Gui/ContextMenu/GuiContextMenuItemFactory.cs	(.../GuiContextMenuItemFactory.cs)	(revision 8e0856bca7d9689c4c09ff2c3008d6cad8c3bef7)
@@ -197,7 +197,7 @@
 
             importInfos = importInfos == null
                               ? importCommandHandler.GetSupportedImportInfos(dataObject)
-                              : importInfos.Where(info => info.IsEnabled(dataObject)).ToArray();
+                              : importInfos.Where(info => info.IsEnabled == null || info.IsEnabled(dataObject)).ToArray();
 
             var importItem = new ToolStripMenuItem(text)
             {
Index: Core/Common/test/Core.Common.Gui.Test/ContextMenu/ContextMenuBuilderTest.cs
===================================================================
diff -u -rc124e36768f6571d317cfcd5c5860b45086efaeb -r8e0856bca7d9689c4c09ff2c3008d6cad8c3bef7
--- Core/Common/test/Core.Common.Gui.Test/ContextMenu/ContextMenuBuilderTest.cs	(.../ContextMenuBuilderTest.cs)	(revision c124e36768f6571d317cfcd5c5860b45086efaeb)
+++ Core/Common/test/Core.Common.Gui.Test/ContextMenu/ContextMenuBuilderTest.cs	(.../ContextMenuBuilderTest.cs)	(revision 8e0856bca7d9689c4c09ff2c3008d6cad8c3bef7)
@@ -654,10 +654,7 @@
             ImportInfo[] importInfos = hasImportersForNodeData
                                            ? new[]
                                            {
-                                               new ImportInfo
-                                               {
-                                                   IsEnabled = o => true
-                                               }
+                                               new ImportInfo()
                                            }
                                            : new ImportInfo[0];
 
@@ -756,10 +753,7 @@
             ImportInfo[] importInfos = hasImportersForNodeData
                                            ? new[]
                                            {
-                                               new ImportInfo
-                                               {
-                                                   IsEnabled = o => true
-                                               }
+                                               new ImportInfo()
                                            }
                                            : new ImportInfo[0];
 
Index: Core/Common/test/Core.Common.Gui.Test/ContextMenu/GuiContextMenuItemFactoryTest.cs
===================================================================
diff -u -r245976332fcbd22a24b30ea2342683ca5577a16e -r8e0856bca7d9689c4c09ff2c3008d6cad8c3bef7
--- Core/Common/test/Core.Common.Gui.Test/ContextMenu/GuiContextMenuItemFactoryTest.cs	(.../GuiContextMenuItemFactoryTest.cs)	(revision 245976332fcbd22a24b30ea2342683ca5577a16e)
+++ Core/Common/test/Core.Common.Gui.Test/ContextMenu/GuiContextMenuItemFactoryTest.cs	(.../GuiContextMenuItemFactoryTest.cs)	(revision 8e0856bca7d9689c4c09ff2c3008d6cad8c3bef7)
@@ -465,10 +465,7 @@
             ImportInfo[] importInfos = hasImportersForNodeData
                                            ? new[]
                                            {
-                                               new ImportInfo
-                                               {
-                                                   IsEnabled = o => true
-                                               }
+                                               new ImportInfo()
                                            }
                                            : new ImportInfo[0];
 
@@ -504,10 +501,7 @@
 
             ImportInfo[] importInfos =
             {
-                new ImportInfo
-                {
-                    IsEnabled = o => true
-                }
+                new ImportInfo()
             };
 
             importCommandHandler.Expect(ich => ich.ImportOn(nodeData, importInfos));
@@ -842,10 +836,7 @@
             ImportInfo[] importInfos = hasImportersForNodeData
                                            ? new[]
                                            {
-                                               new ImportInfo
-                                               {
-                                                   IsEnabled = o => true
-                                               }
+                                               new ImportInfo()
                                            }
                                            : new ImportInfo[0];
 
@@ -885,10 +876,7 @@
 
             ImportInfo[] importInfos =
             {
-                new ImportInfo
-                {
-                    IsEnabled = o => true
-                }
+                new ImportInfo()
             };
 
             importCommandHandler.Expect(ich => ich.ImportOn(nodeData, importInfos));