Oracle Forms

Hi all

I am using Forms 6.0

One problem is arissing when i am populating a listbox when filling in runtime

I had filled data's from a table by using create_group_from query like as below

DECLARE

Rg_id record group;

BEGIN

CLEAR_LIST('LIST_BOX');

Rg_id := Create_Group_From_Query('example',
'SELECT NAME,PLACE FROM SCMASTER);
ERRCODE := POPULATE_GROUP('LIST_BOX');
POPULATE_LIST('LIST_BOX','example');

END;

In the first case no problem occur (ie when I am written in when_new_from_instance)

But
I have to fill data accoding to a certain condition from user request , it make problem

ie if user enter Y in a text box

i have to fill data from one table

if the user enter N in a text box

i have to clear previous data from the list box and again trying to fill into the
list box

this makes error

thanks in advance