i am using following code to fetch data using JsonStore but unable to display it in textfield, although it is being displayed in drop down.

var prices = new Ext.data.JsonStore({
autoDestroy: true,
url: 'transport.php?controller=templates&action=getPrice&propid=' + recId,
root: 'prices',
id: 'propprice',
fields: ['propertyID','price']

and following for textfield in toolbar.

xtype: 'textfield',
name: 'textfield1',
fieldLabel: 'Text field',
value: prices

it displays "[object Object]"in textfield, i have tried prices[0] and prices['price'] as well in this case nothing is displayed.
Can anyone please help me on this?