When I apply loadrecord() to my FormPanel, the TextField binds just fine. However, the checkboxes inside the nested checkbox group control don't. Actually, I noticed that any field that resides inside a nested control will not bind.

<ext:FormPanel runat="server">
   <Body>
      <ext:FormLayout runat="server">
         <ext:Anchor>
            <ext:TextField ID="Key" runat="server" DataIndex="Key" />
         </ext:Anchor>
         <ext:Anchor>
            <ext:CheckboxGroup runat="server">
               <Items>
                  <ext:Checkbox runat="server" DataIndex="Read" />
                  <ext:Checkbox runat="server" DataIndex="Write" />
               </Items>
            </ext:CheckboxGroup>
         </ext:Anchor>
      </ext:FormLayout>
   </Body>
</ext:FormPanel>
What do I have to do to make binding to the fields in nested controls work?