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disable highlighting on tree onClick

How can we disable highlighting in the tree when an item is clicked?

You can't block "selection-on-click" behavior, but you can made it invisible - just update css class of selected item in necessary way
dhtmlxtree.css
.selectedTreeRow{ background-color : navy; color:white; font-family : Verdana, Geneva, Arial, Helvetica, sans-serif;         font-size : 12px;  -moz-user-select: none; }