Describes how it is *supposed* to work, not how it actually works, but
I'll begin implementing the missing pieces as soon as I get my tree to
compile in Unicode mode again...
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_2_BRANCH@6931 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775