Hello,

You can use the property  CheckBox="True" of   ignav:Node tag  to set check  box. Also  you can set property Expanded=true to show  expanded  node. For handle the node checking event you can use the client side events of the tree   <ClientSideEvents NodeChecked="IsChecked" /> and use the JS code.

<script type="text/javascript">

        function IsChecked(treeId, nodeId, check) {

            var tree = igtree_getTreeById(treeId);
            var node = igtree_getNodeById(nodeId);
           
            node.setEnabled(false);  //Disable the node
            node.setExpanded(true); // Expand programmatically  node on client side
           // debugger;
        }
    </script>

Hope this helps.