When you enter the Ok Tab you will see this window:
This option let you change the Ok button text and icon. It happens to some users when they are tired or distracted that they hit the wrong button in the calling Browse, and then hit Ok without give further thought. Those users seldom reads the title bar… but if the button itself have a text according to the function it is about to perform, instead of saying always "ok", it's harder to make a mistake of that nature. Especially when you use the Form to check the data that you are about to delete (a better option in my opinion that erase the data directly from the browse), if the user see a button that says "Delete", it is unlikely that he press it accidentally. This is more likely if the button just says "ok" (the user may think that "ok" take him to the Browse again).
You can also change the icon and the size (width and height) for the ok button, and force the left alignment as well.