cornerView
The view used to draw the area to the right of the column headers and above the vertical scroller of the enclosing scroll view.
Declaration
var cornerView: NSView? { get set }Return Value
The view used to draw the area to the right of the column headers and above the vertical scroller of the enclosing NSScrollView object.
Discussion
The default corner view draws a bezeled rectangle using a blank NSTableHeaderCell object, but you can replace it with a custom view that displays an image, or with a control that can handle mouse events, such as a Select All button. Your custom corner view should be as wide as a vertical NSScroller object and as tall as the header view of the table view.