Null boolean values show as false in the data grid

All,

PgAdmin III 1.2 beta 2
Postgres 8.0 beta 2

I've just noticed that null values in boolean fields show up as false in the 
data grid.  This gave me a few headache this morning.

I thought this had been discussed previously, but I could not see it in 
'Know Issues'.  If it's a wxWindows issue, it could do with being 
documented.

Regards,

Ben

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