cellselecthandler.js

//handles ExtJS grid select event
//grid should have selType = 'cellmodel'
onGridSelect: function(sel, rec, row, col, opts) {        
  var selection = sel.nextSelection;
  var dataIndex = selection.view.getGridColumns()[col].dataIndex;
  var data = rec.get(dataIndex);
  //...your event handler code here
}