[oracle] How to create a dump with Oracle PL/SQL Developer?

Just as an update this can be done by using Toad 9 also.Goto Database>Export>Data Pump Export wizard.At the desitination directory window if you dont find any directory in the dropdown,then you probably have to create a directory object.

CREATE OR REPLACE DIRECTORY data_pmp_dir_test AS '/u01/app/oracle/oradata/pmp_dir_test'; 

See this for an example.