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

setup.h_vms

@@ -344,6 +344,8 @@
 
 #define wxUSE_CHOICEBOOK 1
 
+#define wxUSE_TREEBOOK 1
+
 #define wxUSE_TAB_DIALOG    1
 
 #define wxUSE_GRID         1