title: Is it possible to use the configSource attributes on Custom ConfigurationElement classes in web.config?
body: <p>I know it's possible to reference external configuration files for a configuration section but I'd like to go one step further and reference config files from a configuration element.</p>
  
  <p>i.e.</p>
  
  <p><code>
  &lt;CustomConfigSection&gt;<br>
      &lt;Plugins&gt;<br>
          &lt;Plugin configSource="plugin.config"/&gt;<br>
          &lt;Plugin configSource="another_plugin.config"/&gt;<br>
      &lt;/Plugins&gt;<br>
  &lt;/CustomConfigSection&gt;
  </code></p>