When we drag an item
from right tree to left tree, target tree item does not highlight.
By default
the target item in drag-n-drop process is highlighted in target tree. You can
check the sample at scbr.com/docs/products/dhtmlxTree/index.shtml
Drop target
is not highlighted only if drag-n-drop to this node is not allowed. ( drag item
on its child ))
You can miss
highlighting in next cases:
a) Missed
dhtmlxtree.css
b) Using
“sibling” drag mode ( in such case another visual mark appears)
c) setting
custom dragIn handler which blocks drag-n-drop
d) some rare situation, when items in both tree has the same ID