data binding in datagrid

can someone please help me why data is not being updated in DataGrid
below is the simple code. Log is showing that data is updated in arraylist but same is reflecting in datagrid

MXML-------

```















```

SocketModel.as

```
package views.actionitemviews.stockSocket {
[Bindable]
public class StockModel {
public var symbol:String;
public var price:Number;
public var timestamp:String;
public function StockModel(symbol:String, price:Number, timestamp:String = "") {
this.symbol = symbol;
this.price = price;
this.timestamp = timestamp;
}
}
}
```

Start with the MXML view, especially the ContainerDataBinding bead, DataGrid dataProvider, and updateFromJSON in the embedded script. Then inspect StockModel.as and the [Bindable] fields to trace how changes to existing rows are communicated. Done means updates to price and timestamp in the stock list are reflected in the DataGrid.

Written by the indexing model from the issue text.