title: Check if a ListBox Item has same Text as a TextBox Text
body: <p>I make it short:</p>
  
  <p>How can I check if a <code>TextBox</code> contains the same text as a <code>ListBox</code> item?
  I try to add this function to a timer which scans it each second.<br>
  If there is a name which is in the TextBox it should show a msgbox.  </p>
  
  <p>Is that possible?  </p>