How to simulate "is null" query criteria based on checkbox control value

I have similar problem as this question Using "Is Null" as a criteria based on a form

Unfortunately the accepted answer there is not applicable in my case. I need to simulate "is null" criteria based on control value. Is there any other way or only the answer provided in that question?

What I did so far is created a checkbox control and label it "Remove Null Values" with default value null

then on the criteria of the query I place [Forms]![TempUI]![chkRemoveNoDate]

When I run the query, it does not show items with null values. I am hoping that it will show null items because the default value of the checkbox is null

Any idea how to achieve this?

Thanks