adw::ExpanderRow child rows within view! macro

[lessneek]

Is it the only way to add rows to the adw::ExpanderRow is to call the add_row fn within view! macro?

If I just add child items there is an error:

the method `container_add` exists for struct `ExpanderRow`, but its trait bounds were not satisfied
...
    = note: the following trait bounds were not satisfied:
            `relm4::libadwaita::ExpanderRow: relm4::RelmSetChildExt`
            which is required by `relm4::libadwaita::ExpanderRow: relm4::RelmContainerExt`

[AaronErhardt]

https://relm4.org/book/stable/tricks.html#method-container_add-is-missing