It wasn't the Mode that I wondered about but rather the way you were setting the Binding. Before you had "Binding Path=Action" and I suggested just "Binding Action"

I am not sure about why it is not adjusting to the proper value, but it may be a property of the business object. Let me check on that.
Tim

>Hi Tim,
>
>I've tried with Mode=Default, and TwoWay. I just retried it to make sure. Same result. I'm leaving it as Default for now.
>
>However, after I put the SelectedValue section back in place (after trying Viv's first suggestion) I now notice that the combobox is regularly showing a value upon first view of the window -- although it's simply the first item in the list and is not synchronized with the primary business object's true value. I swear it was not doing this before. It wouldn't display a thing unless I forced a value into the SelectedIndex. Nevertheless, It seems like it's almost working correctly now. I just need the combobox to display the correct value upon first view of the window.
>
>???
>
>
>
>
>>Guy,
>>
>>What happens if you set the SelectedValue more like this:
>>

>>SelectedValue="{Binding Action, Mode=Default}" />
>>

>>
>>Tim