title: Make Value in Dropdownlist not selectable
body: <p>I've created a dropdownlist that looks somewhat like this : </p>
  
  <pre><code>Item1
       Item2
       Item3
  Item4
       Item5
       Item6
       Item7
  </code></pre>
  
  <p>I would like to make Item1 and Item4 as non selectable items. Is this possible with Jquery? 
  <br/>
  LaterEdit:
  I should be able to select item1 and item4 (events) through my class called fooheader 
  and rest of the selectable items are called by fooDetails class.</p>
  
  <p>At the moment my temporary fix makes the next value from the Dll the selected value , but I'm looking for a more elegant solution to the issue </p>