Passing parameter to record group to populate a list of value

Question

i have a record group that populate a list of values
rg_id := Create_Group_From_Query( rg_name,
'SELECT USER_ID USER_ID,'
|| 'TO_CHAR(USER_ID) USER_ID2 '
||'FROM USER_LIST '
||'ORDER BY 2');
but haw i can pass a parameter (the value of a field) in the query that have the ' ' ??
i try this
rg_id := Create_Group_From_Query( rg_name,
'SELECT USER_ID USER_ID,'
|| 'TO_CHAR(USER_ID) USER_ID2 '
||'FROM USER_LIST WHERE USER_A = ' || :B0.FILED1 ||
||'ORDER BY 2');
BUT SEEM NOT WORKING !!!
ANY IDEA ??

Answer 1

ok , thank's work very well, but i have a little problem :
the first time that i choose a value from the first list the second become populate very well, but the second time and over, the second list don't change and remeber the first choise.
rg_id := Find_Group( rg_name );
     VAR_SQL := 'SELECT USER_ID USER_ID, TO_CHAR(USER_ID) USER_ID2 FROM USER_LIST WHERE USER_AGENZIA = ''' || :B0.USER_AGENZIA || ''' ORDER BY 2';
IF Id_Null(rg_id) THEN
rg_id := Create_Group_From_Query( rg_name, VAR_SQL);
END IF;
errcode := Populate_Group( rg_id );
Populate_List('B0.USER_ID', RG_ID);
may be the populate_group ??