Backport change from 1.2.0: src/printwx.cc: When using a standard wxID_xxx id with wxButton, use the implicit default label, as the wx documentation recommends.
git-svn-id: file:///home/survex-svn/survex/branches/1.0@3692 4b37db11-9a0c-4f06-9ece-9ab7cdaee568