Implement this method to customize the Open panel shown by a pop-up–style path.
- macOS 10.5+
The path cell that sent the message.
The Open panel to be displayed.
This method is called before the Open panel is shown but after its allowed file types are set to the cell's allowed types. At this time, you can further customize the Open panel as required. This method is called only when the style is set to
Implementation of this method is optional.