title: Change text of toolbar button for fontsizeselect
body: <p>I have this kind of toolbar for tinyMCE. </p>
  
  <p><a href="https://i.stack.imgur.com/uS0Wz.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/uS0Wz.png" alt="enter image description here"></a></p>
  
  <p>As you can see I am using only Icons for all the buttons. But the button to change the font size contains the text "Font Sizes". How I can change it so that it only show the selected size e.g. "<strong>12px</strong>" by default. </p>
  
  <p>I have actually tried this code: </p>
  
  <pre><code>setup : function(ed)
    {
      ed.on('init', function() 
      {
          this.execCommand("fontSize", false, "12px");
      });
    }  
  </code></pre>
  
  <p>On page load I can see the text "<strong>12px</strong>" for font size button. But as soon as the tinyMCE text area is clicked the text of button changes back to "<strong>Font Sizes</strong>" </p>
  
  <p>Is it somehow possible to totally skip this text "<strong>Font Sizes</strong>" </p>