title: Magento - getUrl for custom extension
body: <p>I have developed a extension and want a link the url to my custom extension.</p>
  
  <p>This is what i have done</p>
  
  <pre><code>Mage::getUrl('productdisplay/index/list');
  </code></pre>
  
  <p>but it is returning me </p>
  
  <p><a href="http://127.0.0.1/magento/index.php/admin_productdisplay/index/list/" rel="nofollow">http://127.0.0.1/magento/index.php/admin_productdisplay/index/list/</a></p>
  
  <p>"admin_" is getting added to the url</p>
  
  <p>I don't know what is the problem </p>