Is that possible to open node by just a single click?
Yes. You should call toggle function at item's onclick event.
Could you tell what files to change?
The file is of course tree.js.
The real question is how to add this onclick event.
Onclick event definition is already present (default action is select item). You should only modify it to call toggle method (use select call pattern);
im also looking to do this. however i know very little of what you refer to. would you mind being more specific as to what needs changed and what to
change it to?
thanks in advance :)
Event hanlder for this is given in Tigra Tree Menu PRO documentation. It should give some idea for those trying to achieve the same with free script.