title: ExtJs 4, How to prevent xtype: 'combo' from collapsing when already selected item clicked?
body: <p>I have <code>ComboBox</code>. When I click on item from expanded list, <code>ComboBox</code> select this item and collapse. If I click on already selected item it also collapsing. </p>
  
  <p><strong>Is there a way to "stop"</strong> <code>ComboBox</code> <strong>collapsing when user select already selected item?</strong></p>
  
  <p>PS: to be short i want <code>ComboBox</code> to behave like <code>TimeField</code> from <a href="http://dev.sencha.com/deploy/ext-4.0.0/examples/themes/index.html" rel="noreferrer">http://dev.sencha.com/deploy/ext-4.0.0/examples/themes/index.html</a> </p>
  
  <p><strong>UPDATE</strong></p>
  
  <p>I don't need solutions that dosen't work at least at IE7 and IE8..</p>