Check old component before hiding it for a component switching. Ref: ticket #37 in assembla - Scribboo try to hide old component before switching to new one. But, old one was already removed. It cause an error. - This is fixed by checking old component if it is still existed before hiding it.

Attach the onchange callback to your config to make tri-state checkboxes work (from change.js)

To read the checked options just do:
  $("SELECT-YOUR-CONTAINER").find("a.checked");
  or if you used "multiple : on"
  YOUR_TREE.selected_arr