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.