Wx_Exp.pm does not appear to have entries for:
enum wxKeyCode {
WXK_NONE = 0,
WXK_CONTROL_A = 1,
described on page:
http://docs.wxwidgets.org/3.0/defs_8h.html#a41c4609211685cff198618963ec8f77d
which makes it difficult to use: wxKeyEvent::GetKeyCode()