The simplest option would be to create another type which does not include the properties you don't wish to show. For this purpose you could use an anonymous type:
FirstName = c.FirstName,
Address = c.Address
Your other option is to manually populate the dropdown in the ribbon. You can check Boby's post in this forum thread
for a reference how this can be achieved. The approach also allows you to modify the string displayed in the drop-down.
Let me know if you have any other comments or questions.
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