Hi DianeWhite,
Thanks for your interest in using Syncfusion Products.
We have modified the sample as per your requirement. We will assure that we will update the sample level fix in our upcoming release.
[Sample Link]
http://www.syncfusion.com/uploads/redirect.aspx?file=WF-TreeViewCoustomControls-98826_6ce194e3.zip&team=developmentPlease let us know if you have any concern.
Reageds,
J Jeraldes