unable to look up current project

Hi All, i popup a JDialog, inside that i execute "Project project = OpenProjects.getDefault().getMainProject();", it always null. If i do:

Lookup lookup = Utilities.actionsGlobalContext();
Project project = lookup.lookup(Project.class);

I can get current project only i click on the project node in projects window. If i click another node, such as any file within any project. The above code return null.

Please help
thanks
from Peter ([email protected])