// based on message dialog style, returns exactly one of: wxICON_NONE,
// wxICON_ERROR, wxICON_WARNING, wxICON_QUESTION, wxICON_INFORMATION
// based on message dialog style, returns exactly one of: wxICON_NONE,
// wxICON_ERROR, wxICON_WARNING, wxICON_QUESTION, wxICON_INFORMATION