AM_FRAME_TO_SKETCH converts a sheet frame to a sketch.
---->(AM_FRAME_TO_SKETCH)----(:FRAME)---|select frame|---->
- :FRAME specifies the frame to convert to a sketch.
Use this action to convert a sheet frame to a sketch. The
sheet that owned the former frame will no longer have a
sheet frame.
AM_VIEW_TO_SKETCH terminate action,
AM_SKETCH_TO_FRAME terminate action