title: what is the Event for 3 dots getting clicked in CommandBar in UWP Apps?
body: <p><strong>Context building:</strong></p>
  
  <p>I have been developing UWP app (C# &amp; XAML) in which I am using a commandbar for displaying some options at the bottom of the page. I am using Primary as well as SecondaryCommands in the commandBar. </p>
  
  <p><strong>What I need:</strong></p>
  
  <p>We have 3 dots at the end. I have one function which will be called when commandbar will be "opened" &amp; "closed". 
  In this function, I need to check if SecondaryCommands menu is opened or not.
  Secondly, I want to know the event name which is equivalent to StateChanged Event in AppbarButton earlier. 
  for #2, already referred this: <a href="https://stackoverflow.com/questions/21658283/click-event-for-the-three-dots-of-the-application-bar-to-change-the-opacit">Click event for the &quot;...&quot; three dots of the application bar to change the opacity</a></p>
  
  <p>Note: I have searched the list which comes when I press space in Visual Studio. On SO, I got links which have discussed for earlier version of Windows. Any help would be appreciated. Thanks in advance.</p>