Get DropDown selected value as string

[eauno1re]

Hello!
I'm stuck with finding a way to get selected value from DropDown widget as string. The ComboBoxText widget has active_text() method that allows to extract string value, but this widget is deprecated since version 4.10.
DropDown has method selected_item() that returns Option<Object> which is meant to be converted to StringObject somehow. But how?
Here is a simple example I'm trying to build:

use gtk::prelude::*;

fn on_activate(application: &gtk::Application)
{
    let window = gtk::ApplicationWindow::new(application);
    let button = gtk::Button::with_label("Print");
    let drop_down = gtk::DropDown::default();
    let strings = vec!["one", "two", "three"];
    let string_list = gtk::StringList::new(strings.as_slice());
    drop_down.set_model(Some(&string_list));
    let combobox = gtk::ComboBoxText::default();
    strings.iter().for_each(|c| combobox.append_text(c));
    let drop_down_clone = drop_down.clone();
    let combobox_clone = combobox.clone();
    button.connect_clicked(move |_| {
        let selected_value_drop_down = match drop_down_clone.selected_item()
        {
            Some(obj) => String::from("???"), // <--- obj has type gtk::glib::Object. How to get string value from obj?
            None => String::from("None")
        };
        println!("{}", selected_value_drop_down);

        let selected_value_combobox = match combobox_clone.active_text()
        {
            Some(str) => String::from(str.as_str()),
            None => String::from("None")
        };
        println!("{}", selected_value_combobox);
    });
    let grid = gtk::Grid::default();
    grid.attach(&button, 0, 0, 1, 1);
    grid.attach(&drop_down, 0, 1, 1, 1);
    grid.attach(&combobox, 0, 2, 1, 1);
    window.set_child(Some(&grid));
    window.present();
}

fn main()
{
    let app = gtk::Application::builder().build();
    app.connect_activate(on_activate);
    app.run();
}

[bilelmoussaoui]

using obj.downcast::<gtk::StringObject>()

[eauno1re]

Thanks! obj.downcast::<gtk::StringObject>().unwrap().string().into() returns String.