(gtk-rs) Adding a child to a AdwViewStackPage

I am having trouble with the documentation and can not seem to fund a way to add a child widget to a libadwaita::ViewStackPage.

I can not see set_child in the doc page here: ViewStackPage in libadwaita - Rust

This is the snippet that is causing problems:
(though this is new to me and it most likely is completely incorrect)

impl MainWindow {
    pub fn new(app: &adw::Application) -> Self {
        Object::new(&[("application", app)]).expect("Failed to create window")
    }

    fn add_pages(&self) {
        let contacts_page = ui::contacts_container::ContactsContainer::new();
        let leaflet = &contacts_page.imp().leaflet.get();

        let page = &self.imp().contacts_page.get();

        page.setset_child(Some(&leaflet));
    }
}

And I am getting this error:

error[E0599]: the method `set_child` exists for reference `&ViewStackPage`, but its trait bounds were not satisfied
  --> src/ui/main_window.rs:75:14
   |
75 |           page.set_child(Some(&leaflet));
   |                ^^^^^^^^^
   |
  ::: /home/bill/.cargo/registry/src/github.com-1ecc6299db9ec823/libadwaita-0.1.1/src/auto/view_stack_page.rs:14:1
   |
14 | / glib::wrapper! {
15 | |     #[doc(alias = "AdwViewStackPage")]
16 | |     pub struct ViewStackPage(Object<ffi::AdwViewStackPage, ffi::AdwViewStackPageClass>);
17 | |
...  |
20 | |     }
21 | | }
   | | -
   | | |
   | | doesn't satisfy `ViewStackPage: IsA<FlowBoxChild>`
   | | doesn't satisfy `ViewStackPage: IsA<Frame>`
   | | doesn't satisfy `ViewStackPage: IsA<ListBoxRow>`
   | | doesn't satisfy `ViewStackPage: IsA<Popover>`
   | | doesn't satisfy `ViewStackPage: IsA<gtk4::Button>`
   | | doesn't satisfy `ViewStackPage: IsA<gtk4::ComboBox>`
   | | doesn't satisfy `ViewStackPage: IsA<gtk4::Window>`
   | | doesn't satisfy `ViewStackPage: libadwaita::prelude::ButtonExt`
   | | doesn't satisfy `ViewStackPage: libadwaita::prelude::ComboBoxExt`
   | | doesn't satisfy `ViewStackPage: libadwaita::prelude::FrameExt`
   | | doesn't satisfy `ViewStackPage: libadwaita::prelude::GtkWindowExt`
   | | doesn't satisfy `ViewStackPage: libadwaita::prelude::ListBoxRowExt`
   | |_doesn't satisfy `ViewStackPage: libadwaita::prelude::PopoverExt`
   |   doesn't satisfy `_: libadwaita::prelude::FlowBoxChildExt`
   |
   = note: the following trait bounds were not satisfied:
           `ViewStackPage: IsA<gtk4::Button>`
           which is required by `ViewStackPage: libadwaita::prelude::ButtonExt`
           `ViewStackPage: IsA<gtk4::ComboBox>`
           which is required by `ViewStackPage: libadwaita::prelude::ComboBoxExt`
           `ViewStackPage: IsA<FlowBoxChild>`
           which is required by `ViewStackPage: libadwaita::prelude::FlowBoxChildExt`
           `ViewStackPage: IsA<Frame>`
           which is required by `ViewStackPage: libadwaita::prelude::FrameExt`
           `ViewStackPage: IsA<ListBoxRow>`
           which is required by `ViewStackPage: libadwaita::prelude::ListBoxRowExt`
           `ViewStackPage: IsA<Popover>`
           which is required by `ViewStackPage: libadwaita::prelude::PopoverExt`
           `ViewStackPage: IsA<gtk4::Window>`
           which is required by `ViewStackPage: libadwaita::prelude::GtkWindowExt`
           `&ViewStackPage: IsA<gtk4::Button>`
           which is required by `&ViewStackPage: libadwaita::prelude::ButtonExt`
           `&ViewStackPage: IsA<gtk4::ComboBox>`
           which is required by `&ViewStackPage: libadwaita::prelude::ComboBoxExt`
           `&ViewStackPage: IsA<FlowBoxChild>`
           which is required by `&ViewStackPage: libadwaita::prelude::FlowBoxChildExt`
           `&ViewStackPage: IsA<Frame>`
           which is required by `&ViewStackPage: libadwaita::prelude::FrameExt`
           `&ViewStackPage: IsA<ListBoxRow>`
           which is required by `&ViewStackPage: libadwaita::prelude::ListBoxRowExt`
           `&ViewStackPage: IsA<Popover>`
           which is required by `&ViewStackPage: libadwaita::prelude::PopoverExt`
           `&ViewStackPage: IsA<gtk4::Window>`
           which is required by `&ViewStackPage: libadwaita::prelude::GtkWindowExt`