The TreePanels have a TreeSorter applied in "folderSort" mode.
Both TreePanels are in "appendOnly" drop mode since they are sorted.
Target node is sorted upon drop to maintain initially configured sort order
Hover at top or bottom edge of the tree to trigger auto scrolling while performing a drag and drop.
The data for this tree is asynchronously loaded with a JSON TreeLoader.
The js is not minified so it is readable. See two-trees.js.