customized Combobox

[SSqt5.2]

Hi,
i am interested to create a combo-box which should appear as shown below.
double_combobox.png

After "highlighting" the index_5 of first combobox i.e. "SiX_6", it should show a second combo-box near to that showing "Days".

I have created a custom widget mycombobox, which contains the 1st combobox with data 'SiX_6', i have attached the signal of this combo box on highlight to a slot defined here, which checks if the selected index is 5, and in that slot, i am creating the 2nd combobox showing days.
I am not able to see the 2nd combobox on screen.

Is the way i am proceeding is correct? or what is the way to do this type of widget?

thanks in advance.

class myComboBox : public QWidget
{
    Q_OBJECT
public:
    explicit myComboBox(QWidget *parent = 0);
    ~myComboBox ();
 
signals:
 
public slots:
    void Activate_2nd_Box(int index);
 
protected:
    QComboBox *box;
    QLabel *label;
 
};
 
 
myComboBox::myComboBox(QWidget *parent) :
    QWidget(parent)
{
    QStringList dump_data;
    dump_data << "ONE_1" << "TWO_2" << "THREE_3" << "FouR_4" << "FivE_5" << "SiX_6";
    QComboBox *doublebox = new QComboBox(this);
    doublebox->addItems( dump_data );
 
 
    connect(doublebox, SIGNAL(highlighted(int)), this, SLOT(Activate_2nd_Box(int)));
    //connect(doublebox, SIGNAL(currentIndexChanged(int)), this, SLOT(Activate_2nd_Box(int)));
}
 
myComboBox::~myComboBox()
{
    delete box;
    delete label;
}
 
void myComboBox::Activate_2nd_Box(int index)
{
    if(index == 5)
    {
        qDebug() << "index : "<< index << " highlighted";
        QStringList data;
        data << "Sunday" << "Monday" << "Tuesday" << "Wednesday" << "Thursday" << "Friday" << "Saturday";
        QComboBox *box2 = new QComboBox(this);
        box2->addItems( data );
 
        box2->show();
    }
}

class myComboBox : public QWidget
{
    Q_OBJECT
public:
    explicit myComboBox(QWidget *parent = 0);
    ~myComboBox ();

signals:

public slots:
    void Activate_2nd_Box(int index);

protected:
    QComboBox *box;
    QLabel *label;

};


myComboBox::myComboBox(QWidget *parent) :
    QWidget(parent)
{
    QStringList dump_data;
    dump_data << "ONE_1" << "TWO_2" << "THREE_3" << "FouR_4" << "FivE_5" << "SiX_6";
    QComboBox *doublebox = new QComboBox(this);
    doublebox->addItems( dump_data );


    connect(doublebox, SIGNAL(highlighted(int)), this, SLOT(Activate_2nd_Box(int)));
    //connect(doublebox, SIGNAL(currentIndexChanged(int)), this, SLOT(Activate_2nd_Box(int)));
}

myComboBox::~myComboBox()
{
    delete box;
    delete label;
}

void myComboBox::Activate_2nd_Box(int index)
{
    if(index == 5)
    {
        qDebug() << "index : "<< index << " highlighted";
        QStringList data;
        data << "Sunday" << "Monday" << "Tuesday" << "Wednesday" << "Thursday" << "Friday" << "Saturday";
        QComboBox *box2 = new QComboBox(this);
        box2->addItems( data );

        box2->show();
    }
}

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