Hi Jeff,
Thanks for your interest in Syncfusion products.
I have included the sample as per your requirement as follows.
[Sample]
http://www.syncfusion.com/uploads/redirect.aspx?&team=support&file=ACComboBoxSamp1080519109.zipPlease have a look on the above sample and let us know if we misunderstood your query or you need further assistance.
We are glad to help you out.
Regards,
Iniyen M.A.