Store.load(param) not working?

[Isnogud]

Hi,
I have a problem with my store and the load() function.
I tried this:
Store:

    config : {
        model : 'MyApp.model.MyAppModel',
        proxy : {
            type : 'ajax',
            url :'../app/statistics.json',
            extraParams: {
                type: 'NECESSARY_TYPE'
            },
            reader : {
                type : 'json',
                rootProperty : 'statistics'
            }
        }
    }

        var myStore= Ext.data.StoreManager.get('MyStore');
        var storeParams = {
            entity: record.get('entityId')
        };
        if (record.get('anotherId')) {
            storeParams.anotherId= record.get('anotherId');
        }
        myStore.load(storeParams);

But it did not work. The entityId was always 1, so it didn't change and I don't know why.
Then I tried this:

myStore.getProxy().setExtraParams({entity: record.get('entityId')});

But it overrides(deletes) the param 'type' in the store/proxy configuration which was also horrible.

Then I did this:

   var myStore= Ext.data.StoreManager.get('MyStore');
        myStore.getProxy().setExtraParams({
            entity: record.get('entityId'),
            anotherId: record.get('anotherId'),
            type : 'NECESSARY_TYPE'
        });
        myStore.load();

And it's working. But I don't want to have too much information in my controller.
What am I doing wrong here?

[Isnogud]

Nevermind, forgot to tell the function that these are params.

var storeParams = {
entityId: record.get('entityId'),
anotherId: record.get('anotherId')
};     
 myStore.load({params : storeParams});