Asks the delegate for a controller that provides a preview column for the specified leaf item.
Original signature is '- (NSViewController *)browser:(NSBrowser *)browser previewViewControllerForLeafItem:(id)item'
Available in Mac OS X v10.6 and later.

C# | Visual Basic | Visual C++ |
NSViewController BrowserPreviewViewControllerForLeafItem( NSBrowser browser, Id item )
Function BrowserPreviewViewControllerForLeafItem ( _ browser As NSBrowser, _ item As Id _ ) As NSViewController
NSViewController^ BrowserPreviewViewControllerForLeafItem( NSBrowser^ browser, Id^ item )

A view controller that provides a preview column, or nil to suppress the preview column.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later)