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Hi Kevin,
Please ignore the previous update.
You can achieve your requirement using PinItemsSortDirection, UnPinItemsSortDirection and PinnedItems properties. You can get the more details from following online documentation link,
http://help.syncfusion.com/ug/wpf/tools/default.htm#!documents/properties16.htm
Please find the sample from following link.
Please let us know in case of further assistance needed.
Regards,
Muthukumar A