Custom Sorting in a Dojo Grid using ItemFileRead/Write store

First understand the below example to see how to plug a grid to a store. 

https://www.ibm.com/developerworks/web/library/wa-aj-dojogrid/

Then to sort alphabetically, based on locale use the code below 

http://stackoverflow.com/questions/12219192/custom-column-sorting-in-dojo-datagrid-programmatically 

              queryGrid.setStore(new dojo.data.ItemFileReadStore(response[responseResult]));  
              setCustomSort(queryGrid.store); 

Define the sort function as below :       

              function setCustomSort(store){
                               if(!store.comparatorMap){
                                       store.comparatorMap = {};
                              }
                              store.comparatorMap["name"] = function (a, b) { 
                              return a.localeCompare(b);
                     }  

For custom sort by date, refer the link below.

http://stackoverflow.com/questions/3967214/dojox-grid-datagrid-custom-sort-method