Index: src/org/openstreetmap/josm/gui/dialogs/PropertiesDialog.java
===================================================================
--- src/org/openstreetmap/josm/gui/dialogs/PropertiesDialog.java	(Revision 248)
+++ src/org/openstreetmap/josm/gui/dialogs/PropertiesDialog.java	(Arbeitskopie)
@@ -209,7 +209,9 @@
 				String key = keys.getEditor().getItem().toString();
 				if (allData.containsKey(key)) {
 					Vector<String> newValues = new Vector<String>(allData.get(key));
-					values.setModel(new DefaultComboBoxModel(newValues));
+					DefaultComboBoxModel newModel = new DefaultComboBoxModel(newValues);
+					newModel.setSelectedItem(values.getModel().getSelectedItem());
+					values.setModel(newModel);
 				}
             }