title: Clear ComboBox selected text
body: <p>I have a <code>ComboBox</code> control with the <code>DropDownStyle</code> properties set to <code>DropDownList</code>.
  Once there is an item selected, how can I clear the selection from the <code>ComboBox</code> without deleting any Items in it ?</p>
  
  <p>I'd normally use something like that:</p>
  
  <pre><code>myComboBox.Text.Clear();
  </code></pre>
  
  <p>But I can't do that.     Any idea how I could clear it ?</p>