HELP Filling a datagrid with data from various tables

Question

MHI, this is simple.
I have 2 tables.
ORDERS and CLIENTS.
table ORDERS are columns:  order_id, client_id, status
table CLIENTS are columns: client_id, client_name
my datagrid would have the columsn: order_id, client_name, status.
Thats all. I can't simply do it in Flex. HELP PLEASE.
These are my approaches:
1 - tried to create a new array collection with mixed data from these 2 tables to use as dataprovider in the datagrid.
even the ac is [Bindable], the datagrid won't update. Probably Im creating the ac in a wrong way.
2 - tried to use the ORDERS table call responder lastResult property (that works out to fill the data grid) and add a new colounm (client_name) within each item inside the ORDERS array collection.
I'm not able to ADD a property/field/column inside the ac.  Of course, when I use .addItem, it will create a new "order"  not a new "order.property"
if something like:  ac.source[i].push({client_name:clientName}) worked...
My goals are simple. To fill the datagrid with those data.
Ah.. i almost forgot...
supose CLIENTS have 1000 registers.
I don't have to bring all those registers within flex to look for only one ID to retrieve a name to fill the orders datagrid, right?
THANKS A LOT
btp~

Answer 1

Ok,  this is my first approach:
this function is an auto-generated event that happens when I drag a databank operator over a datagrid. Datagrid's dataprovider IS set to "orders":
(in my browser, the following messed lines only show decent while editting. Maybe copy it into a editor to better visualize: )
protected function getOrders_pagedResult_resultHandler(event:ResultEvent):void             {                 orders = getOrders_pagedResult.lastResult                          //1 - this was previous declared as a Bindable Array Collection.                                             var ta:Array = new Array;                                 for (var t:String in event.result)                 {                     var tp:Array = new Array();                        tp.push(getOrders_pagedResult.lastResult[t].order_id);        //is it any difference to get data like in THIS LINE                           tp.push(event.result[t].status)                               //or THIS?                                             var cn:String = getClientsByID(event.result[t].client_id);     //this won't work in time. The getClientsByID delays to get data.                     var obj:Object = {client_name:cn};                             //so cn, in this line, will be "null". How can I handle this?                                         tp.push(obj);                                         ta.push(tp)                  }                                 orders.source.push(ta)                                             //this is what I wanted datagrid to show, but it doesn't.                                                                                    //if I leave the first statement, everything above is ignored                                                                                    //if I comment the first line, datagrid shows nothing.                            } 
I realize that the code above won't work because the properties inside each item won't have a "label" to datagrid to call in dataField property...I don't know how to do that. I thought by creating an object (like the obj above) it would work...  it wont.
My getClientsByID is a modificated auto-generated function which doesn't work properly:
(in my browser, the following messed lines only show decent while editting. Maybe copy it into a editor to better visualize: )
protected function getClientsByID(itemID:int):String {         getClientsByIDResult.token = clientsService.getClientsByID(itemID);         return(getClientsByIDResult.lastResult.name); } 
It seems it doesn't work (returns null) because the function runs faster than the call responder result.
Creating a listener for everything seems to be not the best practice, but a band-aid...
Again.
I should create a class in php to return the "ready-to-use" data. Ok?
Thanks a lot for your comments. Do I miss any important part of the code?
Btp~