You can display and
plot a border around the underlay or the clipping boundary.
A frame is a visual border that shows the extents
of the underlay, or the clipped boundary of the underlay. When underlay
frames are hidden, clipped underlays are still displayed to their
specified boundary limits; only the boundary is affected.
Use the DWFFRAME, PDFFRAME, DGNFRAME, or FRAME system variables
to not only display frames, but also to specify whether or not to
plot them. The FRAME system variable changes the setting for all
underlays in the drawing regardless of type.
NoteUnderlays can be
selected if they are not on a locked layer; for example, if the
underlay is part of a named selection set made with the All option
when selecting objects.
The following foreground
example shows the underlay with a visible frame:
The foreground example
shows the underlay with a visible frame.
To hide and show underlay