Index: trunk/src/org/openstreetmap/josm/gui/dialogs/properties/PropertiesDialog.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/dialogs/properties/PropertiesDialog.java	(revision 4106)
+++ trunk/src/org/openstreetmap/josm/gui/dialogs/properties/PropertiesDialog.java	(revision 4107)
@@ -973,4 +973,5 @@
             ed.setButtonIcons(new String[] {"dialogs/delete.png", "cancel.png"});
             ed.setContent(tr("Really delete selection from relation {0}?", cur.getDisplayName(DefaultNameFormatter.getInstance())));
+            ed.toggleEnable("delete_from_relation");
             ed.showDialog();