Hi Dan Guisinger,
The Style applied to Groupbar Splitter can be applied to WPF Grid Splitter.
The GroupBarSplitter in the GroupBar is designed using a Style within which the ControlTemplate is implemented. If you apply that Style in the GridSplitter, you can get an elegant Office-themed GridSplitter.
A sample has been developed that implements GridSplitter applied with the Style of GroupBarSplitter. Hope the sample attached will help you to accomplish your task.
Thanks,
Mohana Sundari.N
sample_fb2a75fe.zip