diff --git a/src/cocoa/notebook.mm b/src/cocoa/notebook.mm
index 5e9bab2a0d..0bad47d58d 100644
--- a/src/cocoa/notebook.mm
+++ b/src/cocoa/notebook.mm
@@ -124,12 +124,6 @@ WX_DECLARE_GET_OBJC_CLASS(WXCTabViewImageItem,NSTabViewItem)
 @end // implementation WXCTabViewImageItem : NSTabViewItem
 WX_IMPLEMENT_GET_OBJC_CLASS(WXCTabViewImageItem,NSTabViewItem)
 
-// ========================================================================
-// wxBookCtrlEvent
-// ========================================================================
-DEFINE_EVENT_TYPE(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGED)
-DEFINE_EVENT_TYPE(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGING)
-
 // ========================================================================
 // wxNotebook
 // ========================================================================
diff --git a/src/common/nbkbase.cpp b/src/common/nbkbase.cpp
index b0466a3eef..1671877483 100644
--- a/src/common/nbkbase.cpp
+++ b/src/common/nbkbase.cpp
@@ -35,6 +35,9 @@
 // implementation
 // ============================================================================
 
+DEFINE_EVENT_TYPE(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGED)
+DEFINE_EVENT_TYPE(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGING)
+
 // ----------------------------------------------------------------------------
 // geometry
 // ----------------------------------------------------------------------------
diff --git a/src/generic/notebook.cpp b/src/generic/notebook.cpp
index 8fd494e9e9..04d8719747 100644
--- a/src/generic/notebook.cpp
+++ b/src/generic/notebook.cpp
@@ -49,9 +49,6 @@
 // event table
 // ----------------------------------------------------------------------------
 
-DEFINE_EVENT_TYPE(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGED)
-DEFINE_EVENT_TYPE(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGING)
-
 BEGIN_EVENT_TABLE(wxNotebook, wxBookCtrlBase)
     EVT_NOTEBOOK_PAGE_CHANGED(wxID_ANY, wxNotebook::OnSelChange)
     EVT_SIZE(wxNotebook::OnSize)
diff --git a/src/gtk/notebook.cpp b/src/gtk/notebook.cpp
index 338a0ed5ef..d26960c945 100644
--- a/src/gtk/notebook.cpp
+++ b/src/gtk/notebook.cpp
@@ -29,13 +29,6 @@
 
 #include <gdk/gdkkeysyms.h>
 
-// ----------------------------------------------------------------------------
-// events
-// ----------------------------------------------------------------------------
-
-DEFINE_EVENT_TYPE(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGED)
-DEFINE_EVENT_TYPE(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGING)
-
 //-----------------------------------------------------------------------------
 // data
 //-----------------------------------------------------------------------------
diff --git a/src/gtk1/notebook.cpp b/src/gtk1/notebook.cpp
index 4b81047c5f..d36a803dac 100644
--- a/src/gtk1/notebook.cpp
+++ b/src/gtk1/notebook.cpp
@@ -31,13 +31,6 @@
 
 #include <gdk/gdkkeysyms.h>
 
-// ----------------------------------------------------------------------------
-// events
-// ----------------------------------------------------------------------------
-
-DEFINE_EVENT_TYPE(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGED)
-DEFINE_EVENT_TYPE(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGING)
-
 //-----------------------------------------------------------------------------
 // idle system
 //-----------------------------------------------------------------------------
diff --git a/src/msw/notebook.cpp b/src/msw/notebook.cpp
index e58dcd3b42..6ee2c39230 100644
--- a/src/msw/notebook.cpp
+++ b/src/msw/notebook.cpp
@@ -120,9 +120,6 @@ static bool HasTroubleWithNonTopTabs()
 
 WX_DEFINE_LIST( wxNotebookPageInfoList )
 
-DEFINE_EVENT_TYPE(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGED)
-DEFINE_EVENT_TYPE(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGING)
-
 BEGIN_EVENT_TABLE(wxNotebook, wxBookCtrlBase)
     EVT_NOTEBOOK_PAGE_CHANGED(wxID_ANY, wxNotebook::OnSelChange)
     EVT_SIZE(wxNotebook::OnSize)
diff --git a/src/os2/notebook.cpp b/src/os2/notebook.cpp
index 81e3a98538..9f7df8f3f9 100644
--- a/src/os2/notebook.cpp
+++ b/src/os2/notebook.cpp
@@ -53,9 +53,6 @@
 // event table
 // ----------------------------------------------------------------------------
 
-DEFINE_EVENT_TYPE(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGED)
-DEFINE_EVENT_TYPE(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGING)
-
 BEGIN_EVENT_TABLE(wxNotebook, wxBookCtrlBase)
     EVT_NOTEBOOK_PAGE_CHANGED(wxID_ANY, wxNotebook::OnSelChange)
     EVT_SIZE(wxNotebook::OnSize)
diff --git a/src/osx/carbon/notebmac.cpp b/src/osx/carbon/notebmac.cpp
index 232d01d258..c534473ad4 100644
--- a/src/osx/carbon/notebmac.cpp
+++ b/src/osx/carbon/notebmac.cpp
@@ -30,10 +30,6 @@
 // check that the page index is valid
 #define IS_VALID_PAGE(nPage) ((nPage) < GetPageCount())
 
-
-DEFINE_EVENT_TYPE(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGED)
-DEFINE_EVENT_TYPE(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGING)
-
 BEGIN_EVENT_TABLE(wxNotebook, wxBookCtrlBase)
     EVT_NOTEBOOK_PAGE_CHANGED(wxID_ANY, wxNotebook::OnSelChange)
 
diff --git a/src/palmos/notebook.cpp b/src/palmos/notebook.cpp
index 37063ae141..05b0697c51 100644
--- a/src/palmos/notebook.cpp
+++ b/src/palmos/notebook.cpp
@@ -38,9 +38,6 @@
 
 WX_DEFINE_LIST( wxNotebookPageInfoList )
 
-DEFINE_EVENT_TYPE(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGED)
-DEFINE_EVENT_TYPE(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGING)
-
 BEGIN_EVENT_TABLE(wxNotebook, wxBookCtrlBase)
     EVT_NOTEBOOK_PAGE_CHANGED(wxID_ANY, wxNotebook::OnSelChange)
 
diff --git a/src/univ/notebook.cpp b/src/univ/notebook.cpp
index e6210f2927..d219fa2162 100644
--- a/src/univ/notebook.cpp
+++ b/src/univ/notebook.cpp
@@ -76,9 +76,6 @@ protected:
 
 static const size_t INVALID_PAGE = (size_t)-1;
 
-DEFINE_EVENT_TYPE(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGED)
-DEFINE_EVENT_TYPE(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGING)
-
 // ----------------------------------------------------------------------------
 // private classes
 // ----------------------------------------------------------------------------