this worked for me! class TowerView < NSView def awakeFromNib tracking_area = NSTrackingArea.alloc.initWithRect self.bounds, options:(NSTrackingCursorUpdate | NSTrackingActiveInActiveApp), owner:self, userInfo:nil puts tracking_area.methods(true,true) self.addTrackingArea tracking_area end end

It's still the same and of course I have the cocoa framework loaded otherwise it wouldn't find the NSTrackingArea class.