Makes a collector-pane the visible child of a switchable-layout, and returns it as well. The switchable layout is found by looking up the parent hierarchy starting from pane .
The switchable layout should have one or more children. If it has one child, a new collector pane is made using
args
as the
initargs
with
buffer-name
defaulting to
"Background Output"
. If it has more than one, it searches through the children to find the first collector pane.