Don't "override" Thaw() in wxAuiNotebook as it's not virtual any more. Override DoThaw() instead. Also use wxBookCtrlBase instead of wxControl as the base class. Closes #14179. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71081 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775