title: Change Eclipse toolbar icon dynamically
body: <p>I've got a toolbar item with its own icon, defined in the plugin.xml file like:</p>
  
  <pre><code>&lt;action
  class="MyActionClass"
  id="MyActionID"
  label="MyActionLabel"
  menubarPath="MyActionMenuBarPath"
  toolbarPath="MyActionToolBarPath"
  icon="icon/myicon.png" &lt;---- this one
       ...
  &lt;/action&gt;
  </code></pre>
  
  <p>How do I change this dynamically when needed? I mean changing it from code</p>