[away3d] HoverCamera3D question

[Kaarigar]

I am totally new to ActionScript as well as Away3D - so pardon me if
my questions sounds silly. I am learning this from the latest book
Flash in 3D.

 I am trying to rotate my model by changing the panAngle and tiltAngle
of the HoverCamera3D. Eventually my purpose is to use mouse to rotate
the model in 3d. This is how I am doing this:

override protected function CreateCamera():void
                {
                        m_pHoverCamera = new HoverCamera3D();
                        m_pHoverCamera.distance = 2000;
                        m_pHoverCamera.tiltAngle = 0;
                        m_pHoverCamera.panAngle = 0;
                        m_pHoverCamera.steps = 0;
                        m_pHoverCamera.yfactor = 1;
                        m_pHoverCamera.wrapPanAngle = true;
                        m_pView.camera = m_pHoverCamera;
                }

protected override function onEnterFrame(ev : Event) : void
                {
                        m_pHoverCamera.tiltAngle += 0.5;
                        //m_pHoverCamera.panAngle += 0.5;
                        trace(m_pHoverCamera.tiltAngle, 
m_pHoverCamera.panAngle);
                        m_pHoverCamera.hover();
                        m_pView.render();
                }

What I am observing is that the tiltAngle does not increase beyond
value 90 - I think its range is -90 to 90. The panAngle on the other
hand behaves as expected. The question is how can I effectively rotate
the model freely in 3D space?

Any comments is highly appreciated. Thank you!