>All this works fine but now I'd like to highlight the row in
>yellow if a percentage is > 35 and in red if greater than 50.

(No way to test this, but it makes sense sitting here) You can do with with DYnamicBackCOlor, not DynamicForeColor. Hopefully, there is a BackColor property for a container, which DynmicBackColor will use, then, what you can do it make the TextBoxes transparent so the containers backcolor becomes their's?