Rick,

>When I choose a binding source and bindingdisplaysource field for an mmCombobox, the combobox looks disabled, and I cannot even click on it on the design surface.

There shouldn't be a problem at all with this...check out the MM .NET sample app...there are a number of combo boxes in the sample forms that should be working fine. If not, it may be that your install of MM .NET is bad, and you may need to reinstall.

Regards,