title: In E4 RCP application, how to add checkbox in the toolbar for part(in Application.e4xmi)
body: <p><img src="https://i.stack.imgur.com/au01J.jpg" alt="Application.e4xmi"></p>
  
  <p>I have been trying to add the tool item with a checkbox for select/deselect all functionality. The handled tool item -> type in application.e4xmi is not helping as it always creates a button in the toolbar. I tried having a custom tool bar by masking the current tool bar implementation, but since the implementation has to be done in View/Part I couldn't find a better solution.</p>
  
  <p>Please suggest a solution?</p>