Wt

#include <Wt/WApplication.h>

#include <Wt/WContainerWidget.h>

#include <Wt/WPushButton.h>

#include <Wt/WPopupMenu.h>

#include <Wt/WNavigationBar.h>

class MyApp : public Wt::WApplication {

    public:

        explicit MyApp(const Wt::WEnvironment &env) : Wt::WApplication(env)

    {

        menu_ = root()->addNew<Wt::WNavigationBar>()->addMenu(Wt::cpp14::make_unique<Wt::WMenu>());

        auto item = std::make_unique<Wt::WMenuItem>("Popup Menu");

        auto popupMenu = Wt::cpp14::make_unique<Wt::WPopupMenu>();

        popupMenu->addItem("Delete Popup Menu")->triggered().connect([=] {

                for (auto item : menu_->items())

                    menu_->removeItem(item);

                });

        item->setMenu(std::move(popupMenu));

        menu_->addItem(std::move(item));

        auto popupButton = Wt::cpp14::make_unique<Wt::WPopupMenu>();

        popupButton->addItem("Delete Popup Button")->triggered().connect([=] { root()->removeWidget(button_); });

        button_ = root()->addWidget(Wt::cpp14::make_unique<Wt::WPushButton>("Popup Button"));

        button_->setMenu(std::move(popupButton));

    }

    private:

        Wt::WPushButton *button_;

        Wt::WMenu *menu_;

};

std::unique_ptr<Wt::WApplication> createApplication(const Wt::WEnvironment &env)

{

    std::unique_ptr<Wt::WApplication> app = std::make_unique<MyApp>(env);

    return app;

}

int main(int argc, char **argv)

{

    return Wt::WRun(argc, argv, &createApplication);

}