diff --git a/src/as/com/threerings/flex/CommandMenu.as b/src/as/com/threerings/flex/CommandMenu.as
index bbfe4cc9..2268717e 100644
--- a/src/as/com/threerings/flex/CommandMenu.as
+++ b/src/as/com/threerings/flex/CommandMenu.as
@@ -105,6 +105,18 @@ public class CommandMenu extends Menu
         return menu;
     }
 
+    /**
+     * Add a separator to the specified menu, unless it would not make sense to do so, because
+     * the menu is empty or already ends with a separator.
+     */
+    public static function addSeparator (menuItems :Array) :void
+    {
+        const len :int = menuItems.length;
+        if (len > 0 && menuItems[len - 1].type != "separator") {
+            menuItems.push({ type: "separator" });
+        }
+    }
+
     /**
      * The mx.controls.Menu class overrides setting and getting the verticalScrollPolicy
      * basically setting the verticalScrollPolicy did nothing, and getting it always returned