If this method is implemented and returns NO, NSToolbar will disable theItem; returning YES causes theItem to be enabled.
Original signature is '- (BOOL)validateToolbarItem:(NSToolbarItem *)theItem'
Available in Mac OS X v10.0 and later.

C# | Visual Basic | Visual C++ |
bool ValidateToolbarItem( NSToolbarItem theItem )
Function ValidateToolbarItem ( _ theItem As NSToolbarItem _ ) As Boolean
bool ValidateToolbarItem( NSToolbarItem^ theItem )

- theItem (NSToolbarItem)
- MISSING

[Missing <returns> documentation for "M:Monobjc.AppKit.INSToolbarItemValidation.ValidateToolbarItem(Monobjc.AppKit.NSToolbarItem)"]

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)