Hi Melinda,
Thank you for your interest in Syncfusion products.
Currently we are not having the overflow method for the WPF grid. We have created a new solution for overflow method separately. Please refer to the sample given below.
http://www.syncfusion.com/uploads/redirect.aspx?file=IBeam_d3293da5_896816db_c252a598.zip&team=developmentRegards
Jeraldes J