Lookup Component - Programatically

Need to ask three questions regarding this component I am creating programatically:

1) How do you select "Modify the SQL statement" programatically.

2) How do you change the actual sql.

3) How do you add a parameter, also programatically.



I have manged to select "Enable memory restriction" by using

instance.SetComponentProperty("CacheType", 2);

but can't add a paramater and modify sql statement. Have used

instance.SetComponentProperty("SqlCommand", statement); and

instance.SetComponentProperty("SqlCommandParam", statement);

with no luck. Any ideas, have searched the web but found nothing.

Thanks.