main.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto">
  <item android:icon="@android:drawable/ic_menu_info_details" android:title="More info" app:showAsAction="always">
    <menu>
      <group android:checkableBehavior="none" android:menuCategory="container">
        <item android:id="@+id/menuItem_show_recyclerViewSample" android:title="show RecyclerView sample"/>
        <item android:id="@+id/menuItem_show_dynamicResizeSample" android:title="show dynamic resizing sample"/>
        <item android:id="@+id/menuItem_current_repository_website" android:title="Repository website"></item>
        <item android:id="@+id/menuItem_all_my_repositories" android:title="All my repositories"></item>
        <item android:id="@+id/menuItem_all_my_apps" android:title="All my apps"></item>
      </group>
    </menu>
  </item>
</menu>