suppress tables based on records in first table

HSMorales

I have a report with 4 tables. each table is binded to different datasets. The first table has a computed column called ROW_COUNT to count the number of rows returned. If ROW_COUNT = 0 the table is suppressed and a message is displayed. I would like to use ROW_COUNT to suppress the other 3 tables if the first table is suppressed. Is there a way I can do this? How can I assign ROW_COUNT to a variable that I can use for the visibility option of the other 3 tables ?? Thanks I am running BIRT 3.7.0