Modify items in datagrid

Question

I have a datagrid that is bound to an array collection. Is
there a simpler way to modify the properties in the datagrid and
have the datagrid change to reflect the changes.. This is my
current code to alter on property and get the datagrid display to
update itself...
var item:Object = DGCollection.getItemAt (0);
item.label= "changed text";
DGCollection.itemUpdated(item);
This code will change the name of a row and update the
datagrid to display the changed text. I always thought that you
could use a one liner to do this same thing. Any ideas? or is this
how you do it

Answer 1

This is what I have:
[Bindable]
private var DGCollection:ArrayCollection = new
ArrayCollection ();
in a callback I receive data from the server and then i use
this line of code to populate the datagrid.
DGCollection.addItem (myObject);
and then here is my datagrid xml:
<mx:DataGrid dataProvider="{DGCollection}"
id="MyDataGrid">
<mx:columns>
<mx:DataGridColumn itemRenderer="MyRenderer1"
dataField="label" headerText="headerText"/>
<mx:DataGridColumn itemRenderer="MyRenderer2"
dataField="label" headerText="headerText"/>
</mx:columns>
</mx:DataGrid>
The data loads just fine but I thought since the datagrid was
bound to the collection that the ui what automatically update when
you change anything on the collection.
I've also tried this chunk of code to try to update the
collection:
DGCollection[myIndex].label = "test";
which doesn't work
is their a piece of code that I can use that updates the
collection automatically?