title: How to filter a GridViewDataComboBoxColumn that has the enable call back property turned on?
body: <p>I'm using callbacks to populate a GridViewDataComboBoxColumn and other columns based on the value of another GridViewDataComboBoxColumn. </p>
  
  <p>using <code>&lt;ClientSideEvents EndCallback="function(s, e) {  populateDefaults(s); }"&gt;&lt;/ClientSideEvents&gt;</code>This functionality is working, but when i try to filter the ASPxGridView i got this <code>Uncaught TypeError: Cannot read property 'SetValue' of null</code></p>
  
  <p>How can I skip EndCallback function when the user uses the filter?</p>
  
  <p><img src="https://i.stack.imgur.com/cu8l2.png" alt="my grid"></p>