w2sidebar re-render the child nodes when collapse and expand.

[vinhpt2]

Hi!
I add a checkbox as html text in node.text of w2sidebar to let user check/unchecked the node. It work ok but when parent node of it collapse and expand, the w2sidebar re-render the sub nodes so it not keep the current checked value of checkbox.
Please help how to prevent w2sidebar re-render the sub-nodes when collapse and expand its parent node.
Thanks