void RelationshipWindow::OnBookCtrl(wxNotebookEvent& event)
#endif // USES_TOOLBOOK
{
    const wxEventType eventType = event.GetEventType();
#if USES_TOOLBOOK
	if ( eventType == wxEVT_COMMAND_TOOLBOOK_PAGE_CHANGED )
#else
	if ( eventType == wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGED )
#endif // USES_TOOLBOOK

	{
		RelationshipPanel * currentPage = wx_static_cast(RelationshipPanel*, m_bookCtrl->GetCurrentPage());
		gMsgHandler = currentPage;
	}