How to make a transparent NSView subclass handle mouse events?

[[NSColor colorWithCalibratedRed:0.01 green:0.01 blue:0.01 alpha:0.05] set];

- (NSView *)hitTest:(NSPoint)aPoint

- (NSView *)hitTest:(NSPoint)aPoint
{
    NSView * clickedView = [super hitTest:aPoint];
    if (clickedView == nil)
    {
        clickedView = self;
    }

    return clickedView;
}