Save Checkbox state

Hi all, I'm looking for a way to keep and reuse the state of checkboxs.
I have checkboxs in a report and when the page is reloaded (from changing an item in a select list with submit) I'm loosing the check/uncheck values of all checkbox item. I'm already creating a collection with the checkbox but I don't know how to use it to re-check the box who were checked before the refresh.
I hope my question is clear enough...thanks for your advice.
Christian

Sergio, I got it
To make this work, I use the third parameter of htmldb_item.checkbox...p_checked_values. So I put a decode and if my value (the one in the checkbox) is in my collection (I build the collection on submit) then I return 'CHECKED' and the current box will be checked.
I'm not sur I'm clear enough but here's the exemple of the select. Remember the collection is build on submit so when any other item is called (like a select_list_with_submit) the collection is build and right after, the checkbox is process.
SELECT COMP.NAME COMP
,HTMLDB_ITEM.CHECKBOX(1,COMP.ID,DECODE(COMP.ID,SELECT C001 FROM HTMLDB_COLLECTIONS WHERE COLLECTION_NAME = 'COMP' AND C001 = COMP.ID),'CHECKED',NULL)) CHECKBOX
FROM COMPETENCIES COMP

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