In order to query the size of notebook page, this page needs to have its
own sizer, otherwise the wxNotebookSizer will ignore it. Notebook pages
-get there sizer by assiging one to them using \helpref{wxWindow::SetSizer}{wxwindowsetsizer}
+get there sizer by assiging one to them using \helpref{wxWindow::SetSizer}{wxwindowsetsizer}
and setting the auto-layout option to TRUE using
\helpref{wxWindow::SetAutolayout}{wxwindowsetautoLayout}. Here is one
example showing how to add a notebook page that the notebook sizer is