Problem
1. Write a subprogram called OK button. Click() that opens a window named Window1 or a window named Window2, depending on whether option buttons named Option1 or Option2, respectively, contain a bullet.
2. Write a subprogram called Option1.Click() that places a bullet in an option button named Option1 and removes the bullet from an option button named Option2.
3. Write a subprogram called Enter Button. Click() that adds the number in a text box named Number Box to a variable, Sum, and then clears the text box.