Using hasMany Association not giving me data for my nested xml

I am getting nested xml from the server

Code:

<row id=1>
<category>
<CategoryId>1</CategoryId>
<CategoryName>test</CategoryName>
</category>
</row>
<row id=2>
<category>
<CategoryId>2</CategoryId>
<CategoryName>test</CategoryName>
</category>
</row>
<row id=3>
<category>
<CategoryId>3</CategoryId>
<CategoryName>tested</CategoryName>
</category>
</row>

for this xml i created model like:

Code:

Ext.define('App.model.CategoryRow',
extend :'App.model.Base',

fields :[{
name :'RowId',
mapping :'@id'
}],
hasMany : ['Category']
});

Code:

Ext.define('App.model.Category',
extend :'App.model.Base',

fields :[{
name :'CategoryId'
},{
name :'CategoryName'
}]
});

Ext.define('App.store.Category',
extend :'Ext.data.Store',
model :'CategoryRow',

proxy :{
type :'ajax',
url :'test/test.php',
reader :{
type :'xml',
record :'row'
}

when i load store with this Model i am getting the RowId but there is no data in record.category() association.

Any idea.

Thnx in advance,

Using hasMany Association not giving me data for my nested xml