How to freeze columns and rows in WPF Grid

How to freeze columns and rows in WPF Grid

I'd like to "freeze" the columns and rows in WPF.
I want to implement a table (state machine), where in the first row are
states and in first column are commands. The rest of the cells are filled
with events. To improve usability, I'd like to keep the first row and
first column visible all the time, so even at the very bottom of the table
the states and commands are visible.
The DataGrid offers this kind of functionality but DataGrid cells don't
look flexible enough. I'd like to use Grid. The ScrollViewer is basically
what I need, but i haven't figured out how to use it for multiple Grids at
the same time.
Is there any way to freeze first row and first column (at the same time)?