How to pass parameters when we create datablock through stored procedure..

Question

I have one table emp table.
I have created one package pk_ref_cursor,In that my recursor return type is record type.
I created one procedure p_test with two parameters...
1. ref cursor type
2. deptno
Now i created one data block through procedure...
Then i run my form it's giving no records.Because i am not passing parameter deptno.
Now i go to block property 'QUERY DATA SOURCE ARGUMENTS'.Here i set the parameter p_deptno is 20
Then i run the form it's giving some records for deptno 20.
But every time i cannot open fmb form and change the property.
Is there any way to pass parameter..
Just see my code...
--Package spec
CREATE OR REPLACE PACKAGE pk_ref_cursor IS
TYPE p_record IS RECORD(p_num emp.empno%TYPE,
p_name emp.ename%TYPE);
TYPE p_ref IS REF CURSOR RETURN p_record;
PROCEDURE p_test(p_data IN OUT p_ref,p_deptno IN NUMBER);
END pk_ref_cursor;
--Package body
CREATE OR REPLACE PACKAGE BODY pk_ref_cursor IS
PROCEDURE p_test(p_data IN OUT p_ref,p_deptno IN NUMBER) IS
BEGIN
OPEN p_data FOR SELECT empno,ename FROM EMP WHERE deptno = p_deptno;
END;     
END pk_ref_cursor;
Thanks,

Answer 1

But how to use package variables...
Can u show me one example..