title: Don't Expand RadComboBox DropDown On Focus
body: <p>RadComboBox(autocomplete) is expanding dropdown list when focused. I want to prevent it when there is no text in autocomplete box.</p>
  
  <p>I tried smth like this </p>
  
  <pre><code>function OnClientTextChange (sender, eventArgs) {
    if (false &amp;&amp; sender.get_text() == "") {
    showDropDown(sender, null);
  }
  </code></pre>
  
  <p>but "OnClientTextChange doesn't fire until the user hits Enter or clicks outside the combobox."</p>
  
  <p>I need different way to prevent expanding dropdown when its text is empty.</p>