Index: /applications/editors/josm/plugins/alignways/src/com/tilusnet/josm/plugins/alignways/AlignWaysPlugin.java
===================================================================
--- /applications/editors/josm/plugins/alignways/src/com/tilusnet/josm/plugins/alignways/AlignWaysPlugin.java	(revision 27397)
+++ /applications/editors/josm/plugins/alignways/src/com/tilusnet/josm/plugins/alignways/AlignWaysPlugin.java	(revision 27398)
@@ -47,5 +47,9 @@
         if(newFrame != null) {
             optBtn = newFrame.addToggleDialog(AlignWaysPlugin.getAwDialog());
+        } else {
+            // Disable menu item in Windows menu
+            awDialog.getWindowMenuItem().setEnabled(false);
         }
+
         if (Main.map != null) {
             Main.map.addMapMode(btn);