title: Multi column grouping in Kendo Grid
body: <p>I am using kendo grid to display a set of records.
  But now I want to use Aggregates property to group columns and perform certain 
  aggregate function on columns.</p>
  
  <p>As per the below documentation,I can apply grouping on a single column,but I want to do grouping on multi column
  <a href="http://demos.telerik.com/kendo-ui/grid/aggregates" rel="noreferrer">http://demos.telerik.com/kendo-ui/grid/aggregates</a> </p>
  
  <p>Please suggest how can I acheive it.</p>
  
  <p>Thanks</p>