Issue with Determining when Checkbox is Null

Hi,

I have a routine that set the value of a particular checkbox to "Null." Later on, I'm using an if statement to evalute if the value of the checkbox is NOT false (meaning a null value should pass the logic test). However, whenever this logic is evaluated, it does not pass the test. For example:

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Then later,

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I would expect that when the If statement is evaluated after CommandButton1 has been clicked, Range A1 would say "Test," but it never does... Help?

Is the TripleState of the checkbox set to True? If not, it can't hold a Null.
I'd change the first statement to

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You can't test for Null by evaluating the value of a checkbox. You need to use IfNull

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Such a simple solution for a problem I spent way too much time trying to fix. Thanks so much; it worked. =)