title: Setting property value from another properties
body: <p>I have a custom control (disabled edit) where I want to show current logged in <code>Domain\User</code>.</p>
  
  <p>I set property like this:</p>
  
  <pre><code>&lt;Property Id="PROP_DOMAINUSER" Value="[%USERDOMAIN]\[LogonUser]"&gt;&lt;/Property&gt;
  </code></pre>
  
  <p>But what I see in edit box is exact text - <code>[%USERDOMAIN]\[LogonUser]</code> and not actual domain and user.</p>
  
  <p>How do I initialize property value from another property then?</p>