This TreeGrid Entry Point is for test purposes. To run the test program, you have to open the file TreeGrid.gwt.xml, and uncomment the line
<entry-point class='com.chap.links.client.TreeGridEntryPoint'/>
such that the entry point is defined.
If you want to create a stand-alone module for the treegrid, you have to comment the line with the entry point again, and then create a jar containing the java and javascript files and images (TreeGrid.java and *Hander.java), TreeGrid.gwt.xml, and the files in the folder public and public/img. This can be done by executing treegrid_export.jardesc.