GTK equivalence to VCL Tristatebox

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Hi

I am converting the cell protection tab page of calc to the new widgets.

On testing, vcl complains that GTK checkbox must be mapped to VCL
Tristatebox. How do I fix that?

Thanks.
- -- 
Olivier Hallot
Founder, Board of Directors Member - The Document Foundation
The Document Foundation, Zimmerstr. 69, 10117 Berlin, Germany
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