How to disable instances of items in forms 4.5 in a mlti row block

I have a multi row database block in forms 4.5 . One of the items is a checkbox. Based on certain conditions the user should be allowed to select only the checkbox only for some rows. How can i selectively disable the checkbox for some record and enable it for the other records.
I know this can be done in OFrms 6i using set_item_instance_property but this is not available in forms 4.5 . Any ideas or workarounds to achieve this ?
Thank You
Satya
Edited by: Satya V on Aug 13, 2009 11:48 AM

I fear there is no direct solution.
May be this is a work-around:
1. Apply the older built-in: Display_item. You can't disable the item with display_item, but you can change the visual attribute and show the user that this item should not be checked.
2. To be shure that the user doesn't ignore this "disable", you need a trigger, which resets the item to the proper value after an illegal change.

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