>> I'll populate the child list as they click on parent items.

When you say "click on", what kind of HTML element are they clicking on, and what event/trigger on that element fires off the "get child records for this selected item" sequence?

Please see this screenshot of what I have created so far: http://www.twitpic.com/2gnmr

You can see my HTML code here: http://stackoverflow.com/questions/686351/master-detail-help-needed-for-asp-net-newbie-screenshot-too

I don't want to see an actual "Select" item beside each Customer Name (that looks goofy). I want the Customer Name to be the link to click on.

I have the ListView to present a list of CustomersWithOpenOrders. But, it's just a static list, so how do I make the Company Name label clickable, and what else will I need to make it fire back to some code-behind to fetch the child records. I already have a code-behind method to get child records for a passed-in CustomerNumber into a DataTable, and I think I would know how to bind that to a grid or listview, but I do not know how to pass the CustomerNumber from the ListView to the method from the UI form.