bool MyPage::Accept()
{
    bool ok=true;

    if( DataIsChanged() )
    {
        switch(PromptYesNoCancel("Data Changed, do you want to save?"))
        {
        case -1: // Cancel;
            ok=false;
            break;
        case 1: // Yes
            if(!SuccessfullySaveD())
                ok=false;
        }
    }
    return ok;
}