-- 1. Put a HIDDEN field P1_IS_LOADED in the region

-- 2. Requesting datas in region becomes:
SELECT /* your columns */
  FROM /* your tables */
WHERE 1 = 1 
  AND nvl(:P1_IS_LOADED, 'N') = 'Y'
   
-- 3. At page level:
>> Post-Rendering > After Regions > Computation > add one computation with: 
    Computation: Static Value: Y