How to make check boxes disappear in selected records in a mult-record block?

I have a multi record block which has a check box. The requirement is to conditionally make specific instances of the check box visible and enabled. I am unable to achieve this using set_item_instance_property as this built-in doesn't support VISIBLE and ENABLED properties.
For example if there a two checkboxes in a multi-record block (one for male/female and the other for pregnant?) I don't want the pregnant? check box visible at all for records where male is opted for
the male/female checkbox. I need this to work both in post-query as well as entry mode.
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I'm afraid this is not possible in Oracle Forms.

However, you could try to build a visual attribute that makes the checkbox 'invisible' through choosing the canvas-colour as the foreground-colour, and then choose this visual attribute where you don't want the checkbox to be seen.

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