Make sure that you have saved your project after you set up the Named Query; named Query resources do not display changes to Perspective until after the Named Query resource has been saved.
I verified that when I set up a Named Query with a parameterized database that the Named Query binding dialog does supply the database as an expected parameter once the Named Query which expects the parameterized database is selected.
My Named Query:
Binding dialog after selecting ExpectsDBAsParam:
