Hi Kyle Fields,
Thank you for using Syncfusion Products.
By setting "syncfusion:DockingManager.TargetNameInDockedMode" to the gridname(another) which has to be stacked with the grid,you can get the grids start "stacked".
Please refer the attached sample.
Please Let us know if you have any queries.
Regards,
Ramalakshmi M.
WpfApplication7_1d34a4eb.zip