hg merge release-5.1 (merge release5.1 into default)

org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/editor/WTableDirEditor.java

@@ -303,6 +303,7 @@ ContextMenuListener, IZoomableEditor
         else
         {
             getComponent().setValue(null);
+            getComponent().setSelectedItem(null);
             oldValue = value;
         }                                
     }