Zooming, Paning and Rotation of 3D object in WPF

Hi guys,

I am new to WPF. Pls help me in this.
I want to dynamically load any .xaml file which had 3D object. Now I am selecting one sample .xaml file using opendialog box. I rendered the Content to the window. Now I am able to do Zoom and Pan. But I am unable to do rotation.

Pls help me in this.

Regards,
Vidyasagar