Datagrid functions with objects with objects

[CodeGirl]

I have a datagrid with a datagrid column.   Except the data object contains a
data object.   

For instance the object may be 

id:int
transaction:Transaction

and Transaction
id:int
accountid:int

Notice since the datagrid is based upon the object that the datafield is
transaction.accountid

                        <mx:DataGridColumn id="accountDC" 
                                                           headerText="Vendor" 
                                                           editable="true" 
                                                           
dataField="transaction.accountid"
                                                           
labelFunction="lookupAccountName"
                                                           
visible="{fullDisplay}"
                                                           width="180"> 


This becomes a problem with generic function such as Lookups and combo boxes
because item[column.dataField] does not work.   ie. 
object[transaction.accountid]

                        protected function lookupAccountName(item:Object,
column:DataGridColumn):String
                        {
                                return accounts.lookupAccountName(item, 
column.dataField);
                        }
                        
Is there a way around this so I can continue to use generic functions?




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