title: how to avoid first item selection by default in wpf Listbox?
body: <p>I want to avoid first item selection that happens by default in <code>Listbox</code> when application loads. I tried with </p>
  
  <pre><code>SelectedIndex= -1
  </code></pre>
  
  <p>but it did not work. I do not want any item to be selected when <code>ListBox</code> loads until user selects any item from <code>Listbox</code>. 
  I have <code>IsSynchronization</code> set to true but making it <code>false</code> also do not solve my problem. Though i have to keep <code>IsSychronization</code> set to <code>true</code> always. But thats ok. i did google but could not find any relevant answer. </p>
  
  <p>Can anyone tell me how to do this ?</p>