title: Error in Dropdownlist
body: <p>On my ASPX page I've added Dropdownlist.</p>
  
  <p>Elements in this list are divided to groups by adding disabled list items:</p>
  
  <pre><code>ListItem separator = new ListItem("---My friends---", "");
  separator.Attributes.Add("disabled", "true");
  _ddUsersList.Items.Add(separator);
  </code></pre>
  
  <p>Those list items are grayed, I can't select it by mouse or by clicking cursor arrows(up/down).
  That is correct.</p>
  
  <p>But problem is, that after clicking '-' key this list item is selected. I think that it is Dropdownlist bug, but I need to find some solution for this.</p>
  
  <p>How to prevent selecting disabled ListItems by clicking first letter from its title? Or there is better way to create separators in Dropdownlist?</p>
  
  <p>Edit:
  I've checked it after Nico G. comment. This problem happens in IE, not in Firefox. (I have no other browsers. Two is enought:) )</p>