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Null As Default Value For Yes/no Field

Null As Default Value For Yes/no Field
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I have the table set up with Null as the default value, and I'd like the Option Group on the form to show the value as Null for new records, but it's showing up False every time. I have one Option Button's value set as -1 and the other as 0. For new records, the default is always False. Just for fun, I opened the table in datasheet view and I don't see any greyed-out checkboxes. I see checkboxes True and False. New records have False in that field. Why does the property sheet accept Null as default value if it doesn't work? What am I missing?
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