Inherit from wxNavigationEnabled<wxBookCtrlBase> instead of just wxBookCtrlBase to ensure that the keyboard navigation works correctly for these controls. The toolbar in wxToolbook still doesn't accept focus from keyboard but at least the pages can be TAB-bed too and from. And the rest of the controls are now fully accessible using only the keyboard. Closes #14303. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71435 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775