use an implicit getter for the facade, so that it is lazily fetched when the property is read rather than at construction time. Throws an error if multitonKey is not yet set.

Author: Cliff Hall

src/org/puremvc/as3/multicore/patterns/observer/Notifier.as

@@ -5,6 +5,7 @@
 package org.puremvc.as3.multicore.patterns.observer
 {
 import org.puremvc.as3.multicore.interfaces.*;
+import org.puremvc.as3.multicore.patterns.facade.Facade;
 
 /**
  * A Base <code>INotifier</code> implementation.
@@ -54,12 +55,18 @@ package org.puremvc.as3.multicore.patterns.observer
 multitonKey = key;
 }
 
-
-// Local reference to the Multiton Facade instance 
-protected var facade:IFacade;
+// Return the Multiton Facade instance 
+protected function get facade():IFacade
+{
+if ( multitonKey == null ) throw Error( MULTITON_MSG );
+return Facade.getInstance( multitonKey );
+}
 
 // The Multiton Key for this app
 protected var multitonKey : String;
 
+// Message Constants
+protected const MULTITON_MSG : String = "multitonKey for this Notifier not yet initialized!";
+
 }
 }