Index: trunk/src/org/openstreetmap/josm/gui/dialogs/PropertiesDialog.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/dialogs/PropertiesDialog.java	(revision 1071)
+++ trunk/src/org/openstreetmap/josm/gui/dialogs/PropertiesDialog.java	(revision 1072)
@@ -653,5 +653,5 @@
 		membershipData.setRowCount(0);
 
-		TreeMap<Relation, Collection<RelationMember>> roles = new TreeMap<Relation, Collection<RelationMember>>();
+		Map<Relation, Collection<RelationMember>> roles = new HashMap<Relation, Collection<RelationMember>>();
 		for (Relation r : Main.ds.relations) {
 			if (!r.deleted && !r.incomplete) {