How to add components to GTK application

help
1 
fn gui_application()
{
    let app = Application::builder()
        .application_id("gui")
        .build();
    app.connect_activate(build_ui);
    app.run();
}
fn build_ui(app: &Application) {

    let _tree_view = TreeView::builder()
        .headers_visible(true)
        .enable_tree_lines(true)
        .enable_search(true)
        .build();
    let window = ApplicationWindow::builder()
        .application(app) 
        .maximized(true)
        .visible(true)
        .add(&_tree_view)
        .build();
    window.present();
}

My attempt to add treeview to windows failed. Prompt method cannot be called on applicationwindowbuilder due to unsatisfied trail boundaries
Thanks for your help!

2

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