[flexcoders] Accessing nested xml tag using e4x and httpService

[matmls]

Below is a sample of my xml file:

<employee id="2" type="part-time">
        <name>
            <firstname>Ann</firstname>
            <lastname>Jones</lastname>
        </name>
        <street>52 Cove Court</street>
</employee>

I can return results with httpService :

 <mx:HTTPService 
        id="srv" 
        url="employee.xml" 
        resultFormat="e4x"
        result="resultHandler(event);"
    fault="faultHandler(event);"        
/>

I can then access the values in the street tag, but NOT firstname or
lastname in a datagrid:

<mx:DataGrid  dataProvider="{srv.lastResult.employee}">
<mx:columns>
<mx:DataGridColumn headerText="Name" dataField="name.firstname"/>
<mx:DataGridColumn headerText="Street" dataField="street"/>
</mx:columns>
</mx:DataGrid>

Is there a syntax problem with the way I am attempting to access
firstname and lastname?  I am able to populate an xml object and
access firstname and lastname with:

myXML.employee.name.lastname


Thanks in advance for any assistance.