title: How to clear away the CloseButton on ActionMode
body: <p>When It is in ActionMode, there is a closeButton on topleft of the screen,when I use setCustomView() to define my own layout, it will appear on the right of the CloseButton.</p>
  
  <p>and in Theme/Style xml file I could just change the style of this button ,cannot clear it.</p>
  
  <p>so, Is there someway to clear away this CloseButton? thanks.</p>