Different tables on Tab control

I'm supporting a legacy Access 2000 database whose primary table has way more fields than it should have if it were normalized. Until I can unravel it, I whipped up a nice set of tab controls so that users could see related data on clean screens. Now I need to display fields from a different table (not the "big" one) on one of those tab controls. However, my Field List only lets me "see" fields from the one table. Am I missing something obvious here? Or is that a limitation of the tab control?