Scenario

I want to update the column data of particular record in grid having store with static data. Here is my store:

:
:
 extend : 'Ext.data.Store',
 model  : 'MyModel',
 autoLoad:true,
 proxy: {
    type: 'ajax',
    url:'app/data/data.json',
    reader: {
        type: 'json',
        root: 'users'
    }
 },

My data.json

 {
 'users': [
           {
            QMgrStatus:"active",
            QMgrName: 'R01QN00_LQYV',    
            ChannelStatus:'active',
            ChannelName : 'LQYV.L.CLNT',
            MxConn: 50
           }
          ]
}

What I am doing to update the record :

var grid = Ext.getCmp('MyGrid');
var store = Ext.getStore('Mystore');
store.each(function(record,idx){
          val = record.get('ChannelName');
          if(val == "LQYV.L.CLNT"){
              record.set('ChannelStatus','inactive');

              record.commit();
           }
  });
console.log(store);
grid.getView().refresh();

MY PROBLEM

I am getting the record updated over here.It is not getting reflected in my grid panel.The grid is using the same old store(static).Is the problem of static data? Or am I missing something or going somewhere wrong? Please help me out with this issue.Thanks a lot.

MY EDIT

I am tryng to color code the column based on the status.But here I am always getting the status="active" even though I am updating the store.

What I am trying to do in my grid

{
        xtype       : 'grid',
        itemId      : 'InterfaceQueueGrid',
        id              :'MyGrid',
        store       : 'Mytore',
        height      : 216,
        width       : 600,
        columns     : [
                      {
                        text: 'QueueMgr Status',
                        dataIndex: 'QMgrStatus' ,
                        width:80
                      },
                      { text: 'Queue Manager \n Name',  dataIndex: 'QMgrName' ,  width: 138},
                      {
                        text: 'Channel Status',dataIndex: 'ChannelStatus' , 
                        width: 78,align:'center',
                        renderer: function(value, meta, record) {
                          var val = record.get('ChannelStatus');
                          console.log(val); // Here I am always getting status="active". 
                          if (val  == 'inactive') { 
                            return '<img src="redIcon.png"/>';
                          }else if (val == 'active') { 
                            return '<img src="greenIcon.png"/>';
                          }
                         }
                   },
                   { text: 'Channel Name', align:'center', dataIndex: 'ChannelName', width: 80}
                   { text: 'Max Connections', align:'center', dataIndex: 'MxConn', width: 80}
              ]
          }