QFileDialog cannot open new directory for saving

In a QFileDialog open in a mode to select directory for saving,
If one enter the name of a not existing directory the "save" button stay disabled and it's not possible to validate because "the directory doesn't exist"
But that's not an expected behaviour if one want to create the new directory with this name.

#include <QtGui>
int main ( int argc,  char **argv)
{
    QApplication app(argc, argv);
    QFileDialog rms_fdg;
    rms_fdg.setFileMode(QFileDialog::Directory);
    rms_fdg.setAcceptMode(QFileDialog::AcceptSave);
    return rms_fdg.exec();
}