[flexcoders] data binding question for Cairngorm?

[markflex2007]

Hi 
 
 I have the carirngorm code here
 
 
 import ca.sb.CESF.ESF.vo.PersonVO;
 
 [Bindable]
 public var modelLocator:CESFESFModel = 
CESFESFModel.getInstance();         
            
                
<mx:TextInput id="eligible_total" x="723.5" y="1294" width="82" 
text="{getEligible
(modelLocator.personData.emptstatus,new_total.text)}"/>


* personData is a instance of PersonVO and it is defined in 
CESFESFModel.

I get a warning error for modelLocator.personData.emptstatus.

The error message is :
 
Data binding will not be able to detect assignments to "emptstatus". 

I already use the  "[Bindable]" for modelLocator but why I can not 
bind "modelLocator.personData.emptstatus"

Thanks


Mark