Index: trunk/src/org/openstreetmap/josm/gui/dialogs/properties/TagEditHelper.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/dialogs/properties/TagEditHelper.java	(revision 8233)
+++ trunk/src/org/openstreetmap/josm/gui/dialogs/properties/TagEditHelper.java	(revision 8234)
@@ -800,4 +800,6 @@
             Main.main.undoRedo.add(new ChangePropertyCommand(sel, key, value));
             changedKey = key;
+            keys.getEditor().setItem("");
+            values.getEditor().setItem("");
         }