Hi Matthew,
Sorry for the inconvenience caused.
We are unable to reproduce the Orientation of AutoComplete popup issue based on the given pseudo code.Please check the sample under the following location.
Sample Link :
http://www.syncfusion.com/uploads/redirect.aspx?&team=support&file=F100685_Updown-1844299825.zipIt would be very helpful for us, if provide any sample for this issue along with version details so that we can assist you further.
Please let me know in case of any queries.
Regards,
Karthick