Added wxTreebook:

- added the control itself
- added protected wxBookCtrlBase::AllowNullPage() to accommodate it
- big changes to the sample to get rid of (most) ugly macros
- added XRC handler for the control
- added docs
- and wxUSE_TREEBOOK everywhere


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@35862 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/treebookevt.inc

@@ -0,0 +1,12 @@
+\wxheading{Event handling}
+
+To process input from a treebook control, use the following event handler macros
+to direct input to member functions that take a \helpref{wxTreebookEvent}{wxtreebookevent} argument.
+
+\twocolwidtha{10cm}
+\begin{twocollist}\itemsep=0pt
+\twocolitem{{\bf EVT\_TREEBOOK\_PAGE\_CHANGED(id, func)}}{The page selection was changed. Processes a wxEVT\_COMMAND\_TREEBOOK\_PAGE\_CHANGED event.}
+\twocolitem{{\bf EVT\_TREEBOOK\_PAGE\_CHANGING(id, func)}}{The page selection is about to be changed. Processes a wxEVT\_COMMAND\_TREEBOOK\_PAGE\_CHANGING event. This event can be \helpref{vetoed}{wxnotifyeventveto}.}
+\twocolitem{{\bf EVT\_TREEBOOK\_NODE\_COLLAPSED(id, func)}}{The page node is going to be collapsed. Processes a wxEVT\_COMMAND\_TREEBOOK\_NODE\_COLLAPSED event.}
+\twocolitem{{\bf EVT\_TREEBOOK\_NODE\_EXPANDED(id, func)}}{The page node is going to be expanded. Processes a wxEVT\_COMMAND\_TREEBOOK\_NODE\_EXPANDED event.}
+\end{twocollist}