有关与布局管理的有关问题，出有关问题了

//mywnd类的头文件
class mywnd : public QWidget
{
    Q_OBJECT
private:
    QLabel *NameLabel;
    QLabel *SexLabel;
    QLabel *TelLabel;
    QLabel *EmailLabel;
    QLabel *BirthdayLabel;
    QLabel *AddrLabel;
    QLabel *AttachLabel;

    QLineEdit *NameEdit;
    QComboBox *SexBox;
    QLineEdit *TelEdit;
    QLineEdit *EmailEdit;
    QDateEdit *BirthdayEdit;
    QLineEdit *AddrEdit;
    QLineEdit *AttachEdit;

    QPushButton *OpenButton;
    QPushButton *AddButton;
    QPushButton *RemoveButton;
    QPushButton *QuitButton;
    QPushButton *SaveButton;
    QPushButton *SaveAsButton;
    QPushButton *CleanButton;
    QPushButton *CloseButton;
    QPushButton *NewButton;

    QStatusBar *Information;
    datatable *MyTable;

    QFile MyFile;
    QDataStream MyStream;
    QMap<QString,info> NewData;
    bool IsSaved;
    QApplication *MyApp;
private slots:
    void add();
    void remove();
    void openfile();
    void save();
    void quit();
    void clean();
    void closefile();
    void saveas();
    void newfile();
signals:
    void datachanged(QMap<QString,info> *);
public:
    mywnd(QApplication *);
};

//mywnd类的构造函数
mywnd::mywnd(QApplication *a)
{
    setWindowTitle(tr("Contact"));

    MyApp=a;
    IsSaved=true;

    NameLabel=new QLabel(tr("&Name"));
    SexLabel=new QLabel(tr("&Sex"));
    TelLabel=new QLabel(tr("&Telephone Number"));
    EmailLabel=new QLabel(tr("&E-mail Address"));
    BirthdayLabel=new QLabel(tr("&Birthyday"));
    AddrLabel=new QLabel(tr("&Address"));
    AttachLabel=new QLabel(tr("Atta&chment"));

    NameEdit=new QLineEdit;
    TelEdit=new QLineEdit;
    SexBox=new QComboBox;
    SexBox->addItem(tr("male"));
    SexBox->addItem(tr("female"));
    EmailEdit=new QLineEdit;
    AddrEdit=new QLineEdit;
    AttachEdit=new QLineEdit;
    BirthdayEdit=new QDateEdit;
    BirthdayEdit->setDisplayFormat(QString("MM.dd.yyyy"));
    BirthdayEdit->setDate(QDate::currentDate());

    AddButton=new QPushButton(tr("&Add"));
    AddButton->setEnabled(false);
    QuitButton=new QPushButton(tr("&Quit"));
    RemoveButton=new QPushButton(tr("&Remove"));
    RemoveButton->setEnabled(false);
    NewButton=new QPushButton(tr("&New"));
    OpenButton=new QPushButton(tr("&Open"));
    OpenButton->setDefault(true);
    SaveButton=new QPushButton(tr("&Save"));
    SaveButton->setEnabled(false);
    SaveAsButton=new QPushButton(tr("Sa&ve As"));
    SaveAsButton->setEnabled(false);
    CleanButton=new QPushButton(tr("C&lean"));
    CloseButton=new QPushButton(tr("&Close"));
    CloseButton->setEnabled(false);

    NameLabel->setBuddy(NameEdit);
    SexLabel->setBuddy(SexBox);
    TelLabel->setBuddy(TelEdit);
    EmailLabel->setBuddy(EmailEdit);
    BirthdayLabel->setBuddy(BirthdayEdit);
    AddrLabel->setBuddy(AddrEdit);
    AttachLabel->setBuddy(AttachEdit);

    Information=new QStatusBar(this);
    MyTable=new datatable(this);

    QFormLayout *UpLayout=new QFormLayout;
    UpLayout->addRow(NameLabel,NameEdit);
    UpLayout->addRow(TelLabel,TelEdit);
    UpLayout->addRow(SexLabel,SexBox);
    UpLayout->addRow(EmailLabel,EmailEdit);
    UpLayout->addRow(BirthdayLabel,BirthdayEdit);
    UpLayout->addRow(AddrLabel,AddrEdit);
    UpLayout->addRow(AttachLabel,AttachEdit);

    QHBoxLayout *DownLayout=new QHBoxLayout;
    DownLayout->addWidget(OpenButton);
    DownLayout->addWidget(NewButton);
    DownLayout->addWidget(AddButton);
    DownLayout->addWidget(RemoveButton);
    DownLayout->addWidget(CleanButton);
    DownLayout->addWidget(SaveButton);
    DownLayout->addWidget(SaveAsButton);
    DownLayout->addWidget(CloseButton);
    DownLayout->addWidget(QuitButton);

    QVBoxLayout *MainLayout=new QVBoxLayout;
    MainLayout->addLayout(UpLayout);
    MainLayout->addWidget(MyTable);
    MainLayout->addLayout(DownLayout);
    MainLayout->addWidget(Information);

    setLayout(MainLayout);
    setFixedHeight(sizeHint().height());

    QObject::connect(QuitButton,SIGNAL(clicked()),this,SLOT(quit()));
    QObject::connect(AddButton,SIGNAL(clicked()),this,SLOT(add()));
    QObject::connect(RemoveButton,SIGNAL(clicked()),this,SLOT(remove()));
    QObject::connect(OpenButton,SIGNAL(clicked()),this,SLOT(openfile()));
    QObject::connect(SaveButton,SIGNAL(clicked()),this,SLOT(save()));
    QObject::connect(CleanButton,SIGNAL(clicked()),this,SLOT(clean()));
    QObject::connect(CloseButton,SIGNAL(clicked()),this,SLOT(closefile()));
    QObject::connect(SaveAsButton,SIGNAL(clicked()),this,SLOT(saveas()));
    QObject::connect(NewButton,SIGNAL(clicked()),this,SLOT(newfile()));
    QObject::connect(this,SIGNAL(datachanged(QMap<QString,info> *)),MyTable,SLOT(update(QMap<QString,info> *)));
}