title: Child web.config can't clear <pages><controls> from parent web.config
body: <p>How can I "clear" the vendor defined <code>&lt;controls&gt;</code> in my child app's web.config?  </p>
  
  <p>Parent Web Config.</p>
  
  <pre><code>&lt;system.web&gt;
      &lt;pages&gt;
          &lt;controls&gt;
               &lt;!-- START: Vendor Custom Control --&gt;
               &lt;add tagPrefix="asp" namespace="VENDOR.Web.UI.Base" assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral /&gt;
               ...
               &lt;!-- END: Vendor Custom Control --&gt;
               ...
             &lt;/controls&gt;
         &lt;tagMapping&gt;
           &lt;add tagType="System.Web.UI.WebControls.WebParts.WebPartManager" mappedTagType="Microsoft.Web.Preview.UI.Controls.WebParts.WebPartManager" /&gt;
           &lt;add tagType="System.Web.UI.WebControls.WebParts.WebPartZone" mappedTagType="Microsoft.Web.Preview.UI.Controls.WebParts.WebPartZone" /&gt;
         &lt;/tagMapping&gt;
       &lt;/pages&gt;
  &lt;/system.web&gt;
  </code></pre>
  
  <p>Child: </p>
  
  <pre><code>&lt;system.web&gt;
      &lt;pages&gt;
          &lt;controls&gt;
              &lt;add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/&gt;
              &lt;add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/&gt;
          &lt;/controls&gt;
          &lt;tagMapping&gt;
              &lt;clear/&gt;
          &lt;/tagMapping&gt;
      &lt;/pages&gt;
  &lt;/system.web&gt;
  </code></pre>
  
  <p>I have it working for the <code>&lt;tagMapping&gt;</code> section, but <code>&lt;controls&gt;</code> does not support <code>&lt;clear/&gt;</code>.</p>