Set variable in a parent form

HI All,
I have a form listing all my items in a datagrid, when I
click in one I open
different form where is all my item description in detail.
But to select one
item from my data I have to setup the item ID, how can I do
that. I try this
but doesn't work.
this.visible = false;
this.parentApplication.itemDesc_mxml.itemNewID =
items_dg.selectedItem.itemID;
this.parentApplication.itemDesc_mxml.visible = true;
In my itemDesc_mxml I have this
[Bindable]public var itemNewID:Number = 0;
public function init():void
if (itemNewID != 0){
my_RO.getItem();
Please help
Rgds
JFB

It's difficult to tell from your code, but this line seems a
bit suspicuos:
this.parentApplication.itemDesc_mxml.itemNewID =
items_dg.selectedItem.itemID;
it may be that you simply want:
itemDesc_mxml.itemNewID = items_dg.selectedItem.itemID;
which I assume you are calling from parent of itemDesc_mxml.
Also when you make itemDesc_mxml visible you should also call
itemDesc_mxml.init( );

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