-const wxEventType wxEVT_COMMAND_TREEBOOK_PAGE_CHANGING = wxNewEventType();
-const wxEventType wxEVT_COMMAND_TREEBOOK_PAGE_CHANGED = wxNewEventType();
-const wxEventType wxEVT_COMMAND_TREEBOOK_NODE_COLLAPSED = wxNewEventType();
-const wxEventType wxEVT_COMMAND_TREEBOOK_NODE_EXPANDED = wxNewEventType();
+wxDEFINE_EVENT( wxEVT_COMMAND_TREEBOOK_PAGE_CHANGING, wxBookCtrlEvent )
+wxDEFINE_EVENT( wxEVT_COMMAND_TREEBOOK_PAGE_CHANGED, wxBookCtrlEvent )
+wxDEFINE_EVENT( wxEVT_COMMAND_TREEBOOK_NODE_COLLAPSED, wxBookCtrlEvent )
+wxDEFINE_EVENT( wxEVT_COMMAND_TREEBOOK_NODE_EXPANDED, wxBookCtrlEvent )