accessing subforms from main form

[FireStrike]

I have two subforms. They are in nice neat grids as access setup for me. Both of these forms should have similar data, based on a upc. What I need to do is turn the text of an entire row to red when there is no matching upc in the other subform. The two problems I cannot figure out is as follows.

1. How can I access the forecolor property of a text box in a subform from the main form?

2. How do I access only one row of data, in the default grid?

Any help would be greatly appriciated.