two DropDownLists controlled in DetailsView

[Mike]

I've a datagrid containing user's information which onselect displays
a detailsview control

in edit mode I've set-up two template fields to map to (country) and
(region) these are dropdownlists from separate data sources.

my question is - while in edit mode of my detailsView how do I make the
(region) change according to what country I choose to select.

I'm using an ObjectDataSource - one for countries and one for regions -
then I'm binding these to the 2 dropdownlists in the edit mode of the
detailsview.


Thanks for any help on this.

Mike