ExtJS 4 store and manage record

I have a question about extjs 4. Below is my storeMsg

   var storeMsg = this.getMessageStore();
                    scope: this,
                    autoLoad: true,
                        read_conditions: Ext.JSON.encode({
                            "employee_rid": '7976', 
                            "year" : '2013',  //etos
                            "kind_holiday_rid" : '1',
                            "request_days" : '5'
                    callback: function(records, operation, success) {
                            // do something after the load finishes


and i take a json response like as

{"total":1,"success":true,"data":[{"status":"true","messages":"\u03a3\u03c9\u03c3\u03c4\u03cc \u03b1\u03af\u03c4\u03b7\u03bc\u03b1 \u03ac\u03b4\u03b5\u03b9\u03b1\u03c2","remain":"25"}]}

I want to take the field status from json (ex true) outside from storeMsg.load(); For example

var vstatus = Ext.StoreMgr.lookup(storeMsg).data.items[0].data.status

but i take message this vstatus is undefined

I have changed my variable (vstatus) of code : var vstatus = Ext.StoreMgr.lookup(storeMsg).getProxy().getReader(); and I am taking and object like as className "Ext.data.reader.Json" and it has some attributes. An attribute is

      remain     25
      status     true
      message    "Is correct"
    total          1
    success       true

and I give in var vstatus = Ext.StoreMgr.lookup(storeMsg).getProxy().getReader().jsonData; and I take this message (undefined). Do you have any idea how take the value from jsonData.data.status = true; tnx

and the fully code about store , proxy and reader is below

       extend       : 'Ext.data.Store',
           model        : 'MHR.model.Message',
           storeId      : 'Message',
           autoLoad         : true,
       proxy        : {
    type: 'ajax',
    api: {
        read    : 'php/crud.php?action=check'

    actionMethods: {
       read    : 'POST',
    reader: {
                type: 'json',
        root: 'data',
        rootProperty: 'data',
        successProperty: 'success',
        messageProperty: 'message'
            extraParams : {
               'read_conditions': ''



try with:

storeMsg.each(function(record) {
    var status = record.get('status');

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