title: Sorting the Grouped data in GridPanel of EXTJS by group_sort_order
body: <p>How to sort the EXT JS Grid Panel grouped data by its sortOrder </p>
  
  <pre><code>{Grouped data}                {Sort Order}
  
  Audi                            [3]
      col11 col22 xol33
      col21 col23 cole3
  Benz                            [1]
      col23 col32 cos32
      col32 dos34 sdfd2
  Citron                          [4]
      jkj23 dfd23 fds23
      jkjkk jjkkk jkkkk
  Nissan                          [2]
      col23 col32 cos32
      col32 dos34 sdfd2
  </code></pre>
  
  <p>Fot the above data I want to by sort its sort order (as i got sort order for each group element in my groupdatastore) as below</p>
  
  <pre><code> Benz                            [1]
      col23 col32 cos32
      col32 dos34 sdfd2
   Nissan                          [2]
      col23 col32 cos32
      col32 dos34 sdfd2
   Audi                            [3]
      col11 col22 xol33
      col21 col23 cole3
   Citron                          [4]
      jkj23 dfd23 fds23
      jkjkk jjkkk jkkkk
  </code></pre>