title: How do I add a menu to a toolbar? gtk3
body: <p><strong>OK I figured out a way. If you have another way you can still give your answer. You may have an easier way. I'll be trying to format a reply for my answer in the meantime. The method I discovered is a little messy so I have to take my time. For now I will leave my answer unaccepted to see if someone else has a better way.</strong></p>
  
  <p>I'm using python with gtk3.</p>
  
  <p>For gtk3 there is a menutoolbutton, but the description of it's usage in the documentation is not clear enough for me.</p>
  
  <p>Besides that I would also like a plain button without the drop arrow for the toolbutton used for this.</p>
  
  <p>If there is a way to do this with the gtk uimanager I would prefer that.</p>