title: Showing 'This folder is empty' background when my shell extension folder is empty
body: <p>In my shell extension, I want to mimic explorer's behavior and show '<em>This folder is empty</em>' message when in fact my folder is empty:</p>
  
  <p><img src="https://i.stack.imgur.com/espte.png" alt="ThisFolderIsEmpty"></p>
  
  <p>However, I can't accomplish it.</p>
  
  <p>Using API Monitor, I see that when explorer refreshes an empty folder, <code>IEnumIDList::Next()</code> is returning the following:</p>
  
  <p><img src="https://i.stack.imgur.com/Qx1HZ.png" alt="APIMonitorScreenshot"></p>
  
  <p>Meaning, that the 'next' item returned is <code>NULL</code>, the number of items is <code>0</code> and the result is <code>S_FALSE</code>.</p>
  
  <p>As mentioned, I tried to mimic the return values, and indeed no items are loaded for the folder, but no message appear either.</p>
  
  <p>So what API would trigger this message?</p>