Changing data grid text color?

programming flash
1

Does anyone know how to do this? Here is my code:

 
   categories.columns = ['ID', 'Category'];
   categories.columns[0].width = 25;
   for each(var category in json_categories) {
    categories.addItem({ID: category['id'], Category: category['name']});
   }

I have tried setColor and that does not work… does anyone know how?