[vtkusers] creating an axes in a view port

[kshivann at engineering.uiowa.edu]

hi all,
    i want to display a 3D axes at the bottom left corner of the viewport. the 
axes has to rotate about its origin when the mouse interaction is on. but the 
zoom and pan shouldn't apply to the 3D axes. is there a way to do the same.

thanks

kiran