In the Epicor Client, the data controls the UI elements and the Epi-Controls respond to the Extended Properties “metadata” defining both a column and a cell. You do not color a control, you color the data; You do not disable a control, you disable the data. We do this so that any control displaying the data - individual field, Grid, or control added via Customization - will display and managed the data in the same way.
Use Row Rules and the UI will behave as you expect.