How to filter form when value selected from combobox is null?

I have a combobox which has null as a valid value.I want the form to get filtered when user selects null as a value also.However no filtering happens when the value is null.I would liketo know is whether it is possible to filter if the record selected is null as the filter criteria will be empty string then?I am not posting any code as my question is just that can criteriabe null and still filter?

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[code]

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