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I started working on updating my sample, and found this: http://tinyurl.com/lesm2a. I think this is a better approach and it's a great sample of several uses of the approach.
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I'll be working on the sample for RIA July CTP shortly. Since the DataForm was changed so much, I'll have to refactor all the way down to the search binding utility class. So, it might not even be this week. The IDictionary stuff should be fairly OK with the new release, although the data fetch portion would have to be refactored. Hope ...
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I would strongly second that request for a multiple load example (minimal UI is fine). I have not broken out my SL3 beta/RIA May CTP application yet to see everything that is broken, but this potential issue concerns me the most. I have multiple entities being loaded at startup into a common context and was checking the count of each to determine ...
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Did you look at this blog post?
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I just xcopy. The only deployment issues I had were 1) when I used the new RIA Silverlight.Application tag in the hosting page -- that worked in dev but not server; and, 2) had to manually deploy Crystal Reports dlls until I built my msi (and had to manually add them there as well, even though they were marked as Copy Always).
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1) Your context (or Dictionary) has to be visible in the page where you're trying to set the combo box's ItemsSource
2) Check the count of the object (or Dictionary if you've already done that earlier like I do) that you are trying to bind to; If it's > 0, you have items to bind.
3) Find the control and then set up Binding ...
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Which is why, to this day, I stick with int's for all keys. They're faster, and less prone to mucking up from tool developers like MS <g>.
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In the Page Loaded event, you should be able to check the count of the object in the context you need for the DataFormComboBoxField. If the required context object has (loaded) members, you should then be able to 1) set up the dictionary for the binding, and 2) call the find control code in the sample, and, 3) set the itemssource and converter ...
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I would do some in-place editing tests to verify that your foreign key is being propagated back to the parent table if you change the selected item in the combobox..
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Looks like a security issue to me. Depending on the server OS, check that NT Authority/Network Service (and possibly <servername>\ASPNET) has access to your database. I found that for an installer for an SL3 app I'm building, I needed to add that user (and Login if needed) to my SQL Server database creation script. Failing that, you ...