'Select in Projects' actions in custom project type

Hi, 

I created a custom project type: http://plugins.netbeans.org/plugin/61050/pleasure-play-framework-plugin and I don't know how to make works the 'Select In Projects' action (Ctrl+Shift+1).

Every time I try to use this functionality in my custom project the following error is show on the status bar: "The document node could not be found in the projects tab."

Any ideas?

Thanks in advance.