title: ExtJs 4 combobox with checkboxes
body: <p>I'm looking for EXTJS4 combobox control which allows selecting multiple items via checkboxes inside. </p>
  
  <p>Actually I need this control <a href="http://lovcombo.extjs.eu/" rel="noreferrer">http://lovcombo.extjs.eu/</a> but it is implemented for ExtJs3. I tried to convert it to ExtJs4 but the task is not trivial actually.</p>
  
  <p>Could you suggest similar component for ExtJs4. Or maybe you could point me to some tutorial or example - how to do such things?</p>