title: RibbonDropDownItem click listener
body: <p>I am developing a powerpoint addin and using the ribbon designer to do this. I have a gallery item which contains <strong>RibbonDropDownItems</strong>. I cannot find a way to add click listeners in there, since <a href="https://msdn.microsoft.com/en-us/library/microsoft.office.tools.ribbon.ribbondropdownitem.aspx" rel="nofollow">RibbonDropDownItem Interface</a> does not have a 'Click' event like <a href="https://msdn.microsoft.com/en-us/library/microsoft.office.tools.ribbon.ribbonbutton.aspx" rel="nofollow">the RibbonButton Interface</a>.</p>
  
  <p>So, is there a way to catch a click event from a RibbonDropDownItem?</p>
  
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  <p><strong>EDIT</strong>:
  Implementing the addin for office 2013-2016</p>