title: set SelectedItem in DropDownList FLEX
body: <p>I am making some simple project and I have problem with selectedItem.
  I have sth like this</p>
  
  <pre><code>&lt;s:State name="Form" enterState="makesService.send()"/&gt;
  </code></pre>
  
  <p>so when I enter this state I take makes from database and populate them to dropdownlist.</p>
  
  <p>but I have also button and on click event I'm changing state to this Form and I want to select specific make from the dropdownlist but I can't. I'm not sure whether I'm doing sth wrong or the problem is that I'm selecting item just before the dropdownlist became populated.</p>
  
  <p>e.x.
  List of make consist of Audi and BMW and when I click button I want to open this state Form in which this dropdownlist exist with selected value e.x. BMW. </p>
  
  <p>How to make this the easiest way ?</p>