Knob Box Controls
The knobs used to control dynamic Pan and Zoom are:
• Lower Left Knob (or key [1] plus the mouse if a virtual knob box is used) -- pans the drawing in the X direction.
• Lower Middle Knob (or key [2] plus the mouse if a virtual knob box is used) -- pans the drawing in the Y direction.
• Lower Right Knob (or key [3] plus the mouse if a virtual knob box is used) -- controls the zoom factor.