title: Add space between Checkboxes and Text of a TreeViewNode
body: <p>I have a TreeView with Checkboxes and want to add spaces between the checkboxes and text of a TreeViewNode. How can I do that?</p>
  
  <h2>Example</h2>
  
  <pre><code>From:
  -A
   -[]b
   -[]c
  
  To
  
  -A
   -[] b
   -[] c
  </code></pre>