Initiates a display Zoom operation. After executing this command,
Move the mouse pointer into the View to be zoomed.
The mouse pointer will change to the cross when it enters a View.
Move the Zoom pointer to a corner of the area to be zoomed.
Click & drag to draw a Zoom Box on the area to be zoomed.
Move the Zoom pointer out of the graphics area to cancel a Zoom operation.
Click on a View to make it active.
Spin the mouse wheel to Zoom the display of the structure model in or out.
Restores a full display of the structure model in the active View.