DataGrid and getItemAt

Question

Hi!
I used in my DataGrid this code:
<mx:itemRenderer>
<mx:Component>
<mx:VBox clipContent="false">
<mx:Text
text="{data.myid[data.myid.length()-1].toString())}"
paddingLeft="5" paddingRight="5" />
</mx:VBox>
</mx:Component>
</mx:itemRenderer>
It works! BUT...I get Warning message: "
For Array, please use ArrayCollection.getItemAt() instead."
I tried to change my code:
<mx:Text
text="{data.myid.getItemAt(data.myid.length()-1).toString())}"
paddingLeft="5" paddingRight="5" />
It doesn't work! :(
I tried this:
<mx:Text
text="{data.dataProvider.myid.getItemAt(data.dataProvider.myid.length()-1).toString())}"
paddingLeft="5" paddingRight="5" />
It doesn't work too :(
Can you tell me how to use getItemAt in my example???
Marcin

Answer 1

Thanks for answer!
First, sorry! I hope that admin move it to Gen. Disc. forum.
My DataProvider is external XML. I thought that AS recognize
it as ArrayCollection. It looks like this:
// load
xmlFiletest.send();
// handle
public var XMLtest : XML;
XMLtest = XML(xmlFiletest.lastResult);
// in my DataGrid
dataProvider="{XMLtest}"
It's really huge XML (few MB's). I don't use addItem because
I don't need this.
Is it mean that this Warning - "For Array, please use
ArrayCollection.getItemAt() instead." is out of sense???
I can try convert it to ArrayCollection but I'm afraid that
can make my app much slower :(((
Do you have some suggestions?