OK, Cancel, and Apply

OK

The OK button applies the settings to the control or dialog as applicable, and dismisses the Properties dialog. The OK button can also be activated with the Enter key.

Apply 

The Apply button applies the selected styles to the control/dialog but does not dismiss the Properties dialog. As noted above, some styles may not be applied to the design-time dialog display - to see the full effects of the selected styles use the Test Mode function (discussed later in this chapter).

Cancel 

Naturally, the Cancel button negates all changes to the control/dialog Properties. Changes to the Favorite sets are not abandoned though.