Patch from euzuro for #448 . Make mouseWheel work on MouseToolbar.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@2102 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Control/MouseDefaults.js

@@ -33,6 +33,15 @@ OpenLayers.Control.MouseDefaults.prototype =
         this.map.events.register( "mousemove", this, this.defaultMouseMove );
         this.map.events.register( "mouseout", this, this.defaultMouseOut );
 
+        this.registerWheelEvents();
+
+    },
+
+    /**
+     * 
+     */
+    registerWheelEvents: function() {
+        
         //register mousewheel events specifically on the window and document
         OpenLayers.Event.observe(window, "DOMMouseScroll", 
                       this.onWheelEvent.bindAsEventListener(this));