On the last tab you can specify parameters, for include and exclude on the trace properties dialog. You can set a specific DBID (which you can get by "SELECT [id], [name] FROM master.dbo.sysdatabases WHERE [name] = 'DBNAMEHERE'"), you will still pick up some stray things but most will be from the DB entered.
"Don't roll your eyes at me. I will tape them in place." (Teacher on Boston Public)