Hi DrBobShepherd,
Do you mean this example, right? I have tried this example, it works, and the trees also appear in the Organizer, you can see the following image.

You can use the range to define the non-active worksheet. For example:
range rr = [book2]sheet2!;
rr!wks.tree.add(input);
rr!wks.tree.input.bb = 0;
Penn