How to use setUserData & getUserData?(tree)

I want to make a link in the tree menu.
But in dhtmlxconnector tree.getUserData tree.setUserData and I do not know how to use.
Create a db on that table to write on is doing??? or whether other way?

Let me know. how to use link or getuserdata & setuserdata?(in dhtmlxconnector)

(my setting = mssql, java)

It was missed in connector 0.9 for java
On next week we will have Connector-for-java 1.0beta , if you interested I can provide a link

So now, how can you make the link’s not working?