Hi Jimmy,
Thanks for your interest in syncfusion products.
You can achieve your requirement by using the AutoComplte's 'MultiSuggestExtended' property. For more information i have included the code snippet and sample as follows.
[Code Snippet]
this.autoComplete1.CaseSensitive = true;
this.autoComplete1.SetAutoComplete(this.comboBox1, Syncfusion.Windows.Forms.Tools.AutoCompleteModes.MultiSuggestExtended);
[Sample]
http://www.syncfusion.com/uploads/redirect.aspx?&team=support&file=ACComboBoxSamp814014491.zipPlease have a look on the above sample and let us know if you need further assistance.
Regards,
Iniyen M.A.