Using Gtk::Bin

[Filipe Apostolo <f apostolo cbr gmail com>]

I've created a class derived from Gtk::Bin that will heave a single child.
In this case will heave an simple Gtk::Button;

class MyWidget : public Gtk::Bin
{
public:
 MyWidget();
 virtual ~MyWidget();

protected:

private:
 Gtk::Button mTestButton;
};
###################

MyWidget::MyWidget():
mTestButton ("Worked")
{
   
    add (mTestButton);

    mTestButton.show();

    show_all();
}

And the I heave a class that uses MyWidget.

class ExampleWindow : public Gtk::Window
{
public:
    ExampleWindow();
   
    virtual ~ExampleWindow();

protected:

    //Signal handlers:
    virtual void on_button_quit();

private:

    Gtk::VBox m_VBox;

    MyWidget m_MyWidget;

    Gtk::HButtonBox m_ButtonBox;

    Gtk::Button m_Button_Quit;
};
##################################

ExampleWindow::ExampleWindow()
:
 m_Button_Quit("Quit")
{
    set_title("Custom Widget example");

    set_border_width(6);

    set_default_size(400, 200);

    add(m_VBox);
   
    m_VBox.pack_start(m_MyWidget, Gtk::PACK_EXPAND_WIDGET);

    m_MyWidget.show();

    m_VBox.pack_start(m_ButtonBox, Gtk::PACK_SHRINK);
    
    m_ButtonBox.pack_start(m_Button_Quit, Gtk::PACK_SHRINK);

    m_ButtonBox.set_border_width(6);

    m_ButtonBox.set_layout(Gtk::BUTTONBOX_END);

    m_Button_Quit.signal_clicked().connect( sigc::mem_fun(*this,
&ExampleWindow::on_button_quit) );

    show_all_children();
}

ExampleWindow::~ExampleWindow()
{
}

void ExampleWindow::on_button_quit()
{
 hide();
}

Can anybody tell me what am I missing? beacause it only appears the
window with the size that I requested and the quit button. The button in
my widget don't appears.

Tanks
F.Apostolo