I find VERY useful to have the "Contents", "Index" and "Search" tabs accessible with a keyboard shortcut. The fastest (not being a valid wx developer) way I knew to do it is to:
*) Add a "View" menu with subcommands "View Contents", "View Index", "View Search"
*) Add keyboard shortcuts to the menu command, statically defined using the standard wx parsing scheme.
As far as I can see the patch works. It's really bad stuff but it gets to the point :-)