if (w.GetReturnCode() == wxID_OK)
{
std::cout << "$$$$ main : user clicked 'OK' $$$$"<<std::endl;
std::cout << "$$$$ selected files : "<<std::endl;
if (w.GetReturnCode() == wxID_OK)
{
std::cout << "$$$$ main : user clicked 'OK' $$$$"<<std::endl;
std::cout << "$$$$ selected files : "<<std::endl;