title: How to Group icons in TinyMce 4
body: <p>In TinyMCE 3x we used have setting something like below: </p>
  
  <p><strong>theme_advanced_buttons1:</strong></p>
  
  <p><strong>theme_advanced_buttons2:</strong></p>
  
  <p>etc ..
  This can be used in tinymce.init to group icons. </p>
  
  <p>how can I do the same in tinymce 4? Is there a way to manually change/add grouping through tinymce.init?</p>
  
  <p>Thanks</p>