Index: trunk/src/org/openstreetmap/josm/gui/dialogs/PropertiesDialog.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/dialogs/PropertiesDialog.java	(revision 724)
+++ trunk/src/org/openstreetmap/josm/gui/dialogs/PropertiesDialog.java	(revision 725)
@@ -510,4 +510,6 @@
 					add();
 				else if (e.getActionCommand().equals("Edit")) {
+					if(propertyTable.getRowCount() == 1)
+						sel = 0;
 					if (sel == -1)
 						JOptionPane.showMessageDialog(Main.parent, tr("Please select the row to edit."));