input.IsMouseDown(MOUSE_WHEEL_*)

[Spencer Sharkey]

function MODULE:Think()


    if (input.IsMouseDown(MOUSE_WHEEL_DOWN)) then
        print("F");
        self.ZoomLevel = math.Clamp(self.ZoomLevel + 1, 1, 3);
    end;
    
    if (input.IsMouseDown(MOUSE_WHEEL_UP)) then
        self.ZoomLevel = math.Clamp(self.ZoomLevel - 1, 1, 3);
    end;
end;

I'm trying to do something like this, but neither of them are returning true.
Am I just doing something stupid or is this broke?

(It is a properly functioning think hook)

[editline]30th January 2012[/editline]

I solved it by using a panel and OnMouseWheeled