property editor propertychange event

Hi,

I create property grid and set store like below. but propertychange doesnt fire.

When I add store.on('update', propertyGrid.onUpdate, propertyGrid) event can fire but source is not like source.FirstName etc. isthere any way to do this.

Code:

        var store = Ext.create('Ext.data.Store', {
            fields: ['name', 'value', 'lovid', 'fieldname'],
            data: [
                { name: 'FirstName', value: 'Oguz' },
                { name: 'LastName', value: 'Turkan' }
            ]
        });
        Ext.getCmp('propertyGrid').bindStore(store);

property editor propertychange event