Prepares the pane to be hidden.
- macOS 10.4+
YES if it is okay to hide the pane; otherwise,
In this required method, you should take any action that’s appropriate just before the printing system hides your custom pane. For example, you could remove notifications or accessory windows that are no longer needed. Returning
YES indicates that the printing system can proceed to hide the pane, probably to show another pane or to dismiss the dialog.