A combobox can be bound to the numeric or character field only. Could checkbox be used instead?

>This shouldn't be so hard....
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>What I'm trying to do is create a self-contained combobox class that will dropdown a Yes/No option, placing a corresponding .t. or .f. into a table. I created an array within my class called yesno(2,2) with the following values:
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>(1,1) = .t.
>(1,2) = "Yes"
>(2,1) = .f.
>(2,2) = "No"
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>My controlsource is tied to a logical field within a table and my boundcolumn is set to 1.
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>When I try to use this combobox, I get the error of a data type mismatch. I have tried various arrays with only one column (logical) and every conceivable variation of bound/unbound, etc....I can get the thing to tell me that the array doesn't exist, but in every other case, it says "data type mismatch"
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>What in the world am I doing incorrectly???
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>As always, my humble thanks in advance.