I have a date field called "dtPurchase" and another called "dtWarranty". I'd like the dtWarranty field to be calculated 1095 days from the dtPurchase date. I put this in the interactive change event of dtPurchase:

ThisForm.txtWarranty.Value=This.Value+1095
ThisForm.Refresh

I keep getting the error "Unknown member dtWarranty". Can someone please tell me what I'm doing wrong?