[Vertical] command will update CPlane by the steps:
Y axis of the updated CPlane will be so determined that Y axis is vertical to pre-updated CPlane.
While
"Specify the origin of CPlane"
prompt is displayed, specify the new origin of the CPlane.
While
"Specify X axis"
prompt is displayed, specify the new X axis direciton of the CPlane. The
straight line from the origin specified in Step 1 to the point specified in
this step will be X axis of the after-updated CPlane.
After-updted X axis will be shown dynamically following to the mouse movement in the screen preview.