Fix issue of showing image incorrectly. - It is discussed in ticket #23 that objects are refreshed partially. - It is actually only for image since multiple image share a image paint, it will modify sampling matrix when they transforming. Values of later ones would over-write eariler ones. - It is fixed by move matrix setting until drawing.

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