title: Hide Row Group header if child group has no rows
body: <p>I have the following Row Groups structure:</p>
  
  <p><a href="https://i.stack.imgur.com/GKBzR.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GKBzR.png" alt="enter image description here"></a></p>
  
  <p>And then under each UnterlagGruppe there is an UnterlagProduct product row. Sometimes, products are not shown but their UnterlagGruppe group name is still shown, like this:</p>
  
  <p><a href="https://i.stack.imgur.com/IvSDA.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/IvSDA.png" alt="enter image description here"></a></p>
  
  <p>As you can see, there are some products that belong to UnterlagGruppe group "Regal 1". They are hidden, but their group header name is still visible. How do I hide the group header name row if there are no children rows in that row group?</p>
  
  <p>I tried this condition for 'hidden' in row visibility:</p>
  
  <pre><code>=IIf(CountRows("UnterlagGruppe") = 0, True, False)
  </code></pre>
  
  <p>But the group header name rows are still visible.</p>
  
  <p>Any tips are appreciated!</p>