Wt

I have a main class with a container that holds some widgets and a class object that represents a different page. When I click on the button it loads the other page from the WStackedWidget but the widgets don't look as I expect them to. Some of them don't even seem to show. I've attached some screenshots. The code is below. In main.cpp, the comments represent the widgets in the WStackedWidget index. (0=Wtext, 1=WPushButton, etc). When I set containerStack->setCurrentIndex(3); then the widgets from the class object display correctly (they all display). If I change the index to 1 and click the button, the page changes, but it doesn't show all the widgets from the class object.

main.cpp

class HelloApplication : public Wt::WApplication
{
public:
    HelloApplication(const Wt::WEnvironment& env);

private:
    WStackedWidget *contain;
    void changePage();
};


void HelloApplication::changePage()
{
    Wt::WApplication *app = Wt::WApplication::instance();
    if (app->internalPath() == "/dashboard") {
        contain->setCurrentIndex(3);
    }
}

HelloApplication::HelloApplication(const Wt::WEnvironment& env) : Wt::WApplication(env)
{   
    Wt::WApplication *app = Wt::WApplication::instance();
    app->internalPathChanged().connect([=] {
        if (app->internalPath() == "/dashboard") {
            contain->setCurrentIndex(3);
        }
    });

    setTitle("Hello world");

    //set bootstrap v3 theme
    auto theme = std::make_shared<Wt::WBootstrapTheme>();
    theme->setVersion(Wt::BootstrapVersion::v3);
    wApp->setTheme(theme);

    auto containerStack{ cpp14::make_unique<Wt::WStackedWidget>() };
    contain = containerStack.get(); //get pointer so that container can be accessed outside of constructor
    Wt::WAnimation animation(Wt::AnimationEffect::Fade, Wt::TimingFunction::Linear, 200);
    containerStack->setTransitionAnimation(animation, true);

    WText *text{ containerStack->addNew<WText>("Hello World!") };   //0
    WPushButton *button{ containerStack->addNew<WPushButton>("Click me!") };    //1
    button->setStyleClass("btn-primary");
    button->clicked().connect([=] {
        app->setInternalPath("/dashboard", true);
    });

    auto panel = Wt::cpp14::make_unique<Wt::WPanel>();
    panel->addStyleClass("centered-example");
    panel->setTitle("Terrific panel");
    panel->setCentralWidget(Wt::cpp14::make_unique<Wt::WText>("This is a panel with a title."));

    containerStack->addWidget(std::move(panel));    //2
    dashboard *dash{ containerStack->addNew<dashboard>() }; //3

    containerStack->setCurrentIndex(1);
    root()->addWidget(std::move(containerStack));
}

dashboard.h

class dashboard : public WContainerWidget
{
public:
    dashboard();
    WPushButton *button;
    WText *text;
    WGroupBox *groupBox;
    WPanel *panel;

    ~dashboard();
};

dashboard.cpp
dashboard::dashboard()
{
    button = this->addWidget(cpp14::make_unique<WPushButton>("Dashboard button"));
    text = this->addWidget(cpp14::make_unique<WText>("This is your dashboard."));

    groupBox = this->addWidget(cpp14::make_unique<Wt::WGroupBox>("A group box"));
    groupBox->addStyleClass("centered-example");
    groupBox->addWidget(Wt::cpp14::make_unique<Wt::WText>("<p>Some contents.</p>"));
    groupBox->addWidget(Wt::cpp14::make_unique<Wt::WText>("<p>More contents.</p>"));

    panel = this->addWidget(cpp14::make_unique<Wt::WPanel>());
    panel->addStyleClass("centered-example");
    panel->setTitle("Terrific panel");
    panel->setCentralWidget(std::unique_ptr<WPushButton>(button));
}

Why do the widgets not display?