title: ASP.NET Ajax - Autocompleteextender control appears behind other controls
body: <p>To be specific I have a search form with an autocompleteextender at the top. When you type in a string, it autocompletes with matches in a drop down as expected. </p>
  
  <p>The problem is that a couple of SliderExtender controls further down the form are appearing above the autocomplete dropdown (it is not covering these controls). </p>
  
  <p>I've looked around but can't find an answer yet. It seems that the problem can occur with other controls and not specific to these.</p>