title: Event to handle the deletion of attachments while composing a New Mail
body: <p>Hi I am new to outlook addin programming.
  I have a doubt and can not find anything related to this.</p>
  
  <p>I want to capture the event in C# as and when an end user deletes a selected attachment from a compose mail by any means like by pressing backspace in attachment section.</p>
  
  <p>Any help will be highly appreciated.</p>