If I use the standard SF control, combobox, my form works just fine; however, we have invested a good chunk into the DevExpress control suite, so I thought I would see how these work within the framework.  Since I am still working on the trial software, I downloaded the 6.3.3 version of DevExpress and installed it.  Then, I added the SF wrapped 6.3 controls to the VS IDE.  After dropping a comboBoxEdit control onto the form, I went through the exact same motions as I did for the SF comboBox.  Then, F5. 

The ComboBoxEdit is filled with data; however, the selected value never changes.  The visual behavior is as if it snaps back to the top of the list (a blank item) after I pick a different item on the list.  If I add a topmost item to the wrapped control, it does the same thing.  If I attempt to change the SelectedItem property from -1 to 0, the SelectedItem property reverts back to -1 as soon as I tab off of that field. 

Please note that I am using the PopulationType as Enumeration.  And, also note, the enum list performs beautifully on other forms by using the non-DevEx ComboBox control.

Thanks!
Bill