title: Update or Reload Store of ExtJs ComboBox
body: <p>I'd like to know a way of how to update or reload the list values of a ExtJs ComboBox. For instance, I have a some checkboxes. These checkboxes determine what values the ComboBox should have. So, after selecting some of those, I click the drowndown list (combobox) to see the values. </p>
  
  <p>In short, how can I change the values (store) of a ComboBox already has.</p>
  
  <p>Hope someone can help me</p>
  
  <p>Thanks</p>