datagrid cannot be found - apache-flex

Question

I create each datagrid to be added to the NavigatorConent(), however, how do I retrieve the datagrid by ID so that I can point the ArrayCollection to datagrid's dataprovider?
private var pdg:String;
private function stabAdd():void {
var dg1:DataGrid = new DataGrid();
var cn:NavigatorContent = new NavigatorContent();
stab.addElement(cn);
cn.name = "nc"+nu;
dg1.id = "nc"+nu;
pdg = dg1.id;
dg1.addEventListener(MouseEvent.CLICK,cc);
nu++;
This will throw an error which pdg cannot be found, I wonder why:
trace(DataGrid(pdg));

Answer 1

The purpose of nu++ is to assign a
unique name (dg1, dg2, etc) to each
datagrid so that I can assign AC to
that datagrid's dataprovider
I can respect the need to give every component a unique name. The appropriate way to do that in ActionScript is not to specify the id/name field of the component, but rather to create an instance of the component as a variable. Something like this:
protected var myGrid : DataGrid;
And you can now access myGrid anywhere in the component, or in it's children, without creating some complicated scheme. If you need multiple DataGrid's you can store them in an array:
protected var myGridArray : Array = new Array();
And somewhere later in your code--probably createChildren() do something like this:
loop
var newGrid : DataGrid = new DataGrid()
myGridArray.push(newGrid);
end loop
For the most part, this is how all the Flex list based components do it with itemRenderers. They have an array of visible renderers.
As stated in #J_A_X_ comments, you are trying to convert pdg--a string--into a DataGrid. I would expect that to return a null value, as Flex casts tend to fail quietly.
If you want more help, you'll have to tell us the explicit error that you're receiving, possibly with line numbers and more code.