Application Express :: Create Collection In A Process To Fire On Page Load

My collection is not working as expected, what could be the issue here. This is what i did,

1. I created a collection in a process to fire on page load

if apex_collection.collection_exists(p_collection_name=>'MMMM') then
apex_collection.delete_collection(p_collection_name=>'MMMM');
end if;
APEX_COLLECTION.CREATE_OR_TRUNCATE_COLLECTION(p_collection_name => 'MMMM');

2. On my page i have a text field P1_text1 when i enter value into text field like ="sample data" i want this data loaded into my collection, so i created a button and added a process(on submit - before computations...) so it should insert into the collection when i click the button but no data is loaded, process:

APEX_COLLECTION.ADD_MEMBER(
p_collection_name => 'MMMM',
p_c001 => :P1_TEXT1,
p_c002 => 'TESTDATA' );

3. when i run the below query it shows "no data found" ,

SELECT c001,c002
FROM APEX_COLLECTIONS
WHERE collection_name = 'MMMM';