gitlabhq/app/views/refs/_head.html.haml

%ul.nav.nav-tabs
  %li
    = form_tag switch_project_refs_path(@project), method: :get, class: "project-refs-form", remote: true do
      = select_tag "ref", grouped_options_refs, onchange: "$(this.form).trigger('submit');", class: "project-refs-select"
      = hidden_field_tag :destination, "tree"
      = hidden_field_tag :path, params[:path]
  %li{class: "#{'active' if (controller.controller_name == "refs") }"}
    = link_to tree_project_ref_path(@project, @ref) do
      Source