diff --git a/include/wx/osx/evtloop.h b/include/wx/osx/evtloop.h
index 4e45db718c..00a5258fce 100644
--- a/include/wx/osx/evtloop.h
+++ b/include/wx/osx/evtloop.h
@@ -53,9 +53,14 @@ public:
       AddSourceForFD(int fd, wxEventLoopSourceHandler *handler, int flags);
 #endif // wxUSE_EVENTLOOP_SOURCE
 
-    void ObserverCallBack(CFRunLoopObserverRef observer, int activity);
 
 protected:
+    void CommonModeObserverCallBack(CFRunLoopObserverRef observer, int activity);
+    void DefaultModeObserverCallBack(CFRunLoopObserverRef observer, int activity);
+
+    static void OSXCommonModeObserverCallBack(CFRunLoopObserverRef observer, int activity, void *info);
+    static void OSXDefaultModeObserverCallBack(CFRunLoopObserverRef observer, int activity, void *info);
+
     // get the currently executing CFRunLoop
     virtual CFRunLoopRef CFGetCurrentRunLoop() const;
 
@@ -74,8 +79,11 @@ protected:
     // cfrunloop
     CFRunLoopRef m_runLoop;
 
-    // runloop observer
-    CFRunLoopObserverRef m_runLoopObserver;
+    // common modes runloop observer
+    CFRunLoopObserverRef m_commonModeRunLoopObserver;
+
+    // default mode runloop observer
+    CFRunLoopObserverRef m_defaultModeRunLoopObserver;
 
 private:
     // process all already pending events and dispatch a new one (blocking
diff --git a/src/osx/core/evtloop_cf.cpp b/src/osx/core/evtloop_cf.cpp
index f151cb5684..f83729f1c9 100644
--- a/src/osx/core/evtloop_cf.cpp
+++ b/src/osx/core/evtloop_cf.cpp
@@ -147,14 +147,21 @@ wxCFEventLoop::AddSourceForFD(int WXUNUSED(fd),
 
 #endif // wxUSE_EVENTLOOP_SOURCE
 
-extern "C" void wxObserverCallBack(CFRunLoopObserverRef observer, CFRunLoopActivity activity, void *info)
+void wxCFEventLoop::OSXCommonModeObserverCallBack(CFRunLoopObserverRef observer, int activity, void *info)
 {
     wxCFEventLoop * eventloop = static_cast<wxCFEventLoop *>(info);
     if ( eventloop )
-        eventloop->ObserverCallBack(observer, activity);
+        eventloop->CommonModeObserverCallBack(observer, activity);
 }
 
-void wxCFEventLoop::ObserverCallBack(CFRunLoopObserverRef WXUNUSED(observer), int activity)
+void wxCFEventLoop::OSXDefaultModeObserverCallBack(CFRunLoopObserverRef observer, int activity, void *info)
+{
+    wxCFEventLoop * eventloop = static_cast<wxCFEventLoop *>(info);
+    if ( eventloop )
+        eventloop->DefaultModeObserverCallBack(observer, activity);
+}
+
+void wxCFEventLoop::CommonModeObserverCallBack(CFRunLoopObserverRef WXUNUSED(observer), int activity)
 {
     if ( activity & kCFRunLoopBeforeTimers )
     {
@@ -170,21 +177,30 @@ void wxCFEventLoop::ObserverCallBack(CFRunLoopObserverRef WXUNUSED(observer), in
             wxTheApp->ProcessPendingEvents();
     }
 
+    if ( activity & kCFRunLoopBeforeWaiting )
+    {
+#if wxUSE_THREADS
+        wxMutexGuiLeaveOrEnter();
+#endif
+    }
+}
+
+void wxCFEventLoop::DefaultModeObserverCallBack(CFRunLoopObserverRef WXUNUSED(observer), int activity)
+{
+    if ( activity & kCFRunLoopBeforeTimers )
+    {
+    }
+    
     if ( activity & kCFRunLoopBeforeWaiting )
     {
         if ( ProcessIdle() )
         {
             WakeUp();
         }
-        else
-        {
-#if wxUSE_THREADS
-            wxMutexGuiLeaveOrEnter();
-#endif
-        }
     }
 }
 
+
 wxCFEventLoop::wxCFEventLoop()
 {
     m_shouldExit = false;
@@ -194,15 +210,21 @@ wxCFEventLoop::wxCFEventLoop()
     CFRunLoopObserverContext ctxt;
     bzero( &ctxt, sizeof(ctxt) );
     ctxt.info = this;
-    m_runLoopObserver = CFRunLoopObserverCreate( kCFAllocatorDefault, kCFRunLoopBeforeTimers | kCFRunLoopBeforeWaiting , true /* repeats */, 0,
-                                            wxObserverCallBack, &ctxt );
-    CFRunLoopAddObserver(m_runLoop, m_runLoopObserver, kCFRunLoopCommonModes);
-    CFRelease(m_runLoopObserver);
+    m_commonModeRunLoopObserver = CFRunLoopObserverCreate( kCFAllocatorDefault, kCFRunLoopBeforeTimers | kCFRunLoopBeforeWaiting , true /* repeats */, 0,
+                                                          (CFRunLoopObserverCallBack) wxCFEventLoop::OSXCommonModeObserverCallBack, &ctxt );
+    CFRunLoopAddObserver(m_runLoop, m_commonModeRunLoopObserver, kCFRunLoopCommonModes);
+    CFRelease(m_commonModeRunLoopObserver);
+
+    m_defaultModeRunLoopObserver = CFRunLoopObserverCreate( kCFAllocatorDefault, kCFRunLoopBeforeTimers | kCFRunLoopBeforeWaiting , true /* repeats */, 0,
+                                                           (CFRunLoopObserverCallBack) wxCFEventLoop::OSXDefaultModeObserverCallBack, &ctxt );
+    CFRunLoopAddObserver(m_runLoop, m_defaultModeRunLoopObserver, kCFRunLoopDefaultMode);
+    CFRelease(m_defaultModeRunLoopObserver);
 }
 
 wxCFEventLoop::~wxCFEventLoop()
 {
-    CFRunLoopRemoveObserver(m_runLoop, m_runLoopObserver, kCFRunLoopCommonModes);
+    CFRunLoopRemoveObserver(m_runLoop, m_commonModeRunLoopObserver, kCFRunLoopCommonModes);
+    CFRunLoopRemoveObserver(m_runLoop, m_defaultModeRunLoopObserver, kCFRunLoopDefaultMode);
 }