Toolbar button similar to the "Document View" dropdown

Is there documentation or any sample on how to create a ribbon dropdown button in Create/Content Editor which displays in a manner similar to the Document View button?  In other words, it displays menu-items that contain no icons and can toggle a bullet for the selected item...  When I try this based on sample markup in the docs, my main button icon on <ribbon-normalbuttondropdown> is replicated on each menu item in the dropdown.

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