At least in wxGTK it is necessary to remove the page from the notebook first as reparenting it doesn't work otherwise currently. This should ideally be fixed but in the meanwhile at least document it. See #13305. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@68214 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775