I Want To Show Previous Form With Close Button

i have 3 forms 1.Booking & 2.Installment 3.Report, i created report to load 1 and 2 report when i click on print button. and in report form i use own close button (disable Form Control Box). Now i want if i use print command from Booking Form and after print i close the Report Form it'll back to Booking & when i use print command from Installment Form after print it'll back to Installment Form. i tried to use If function but i can't understand how i do?