Anybody knows why this doesn't longer works in 3.1.1. I've used it in previous releases but after upgrade it stopped working.

After viewing rendered html you can see that this attribute is rendered in 'rich' namespace

<td class="dr-tree-h-ic rich-tree-node-icon dr-tree-h-ic-line-clp"
 id="leftPanel:assetsTree:0:j_id22:icon"
 rich:draggableoptions="{'parameters':{....} } "
 rich:dropzoneoptions="{} "
 rich:oncontextmenu="return false;">

Maybe it is something in template? Well currently I've managed to get this working by putting a 'div' inside of treeNode and using oncontextmenu of that div element.

Any help appreciated.