passing boolean arguments to p-cell

Hi, 

I'm trying to pass boolean arguments to a p-cell I've created, but the value in the p-cell always assumes the default value. 

In my p-cell definition, I have:

pcDefinePCell(

list( ddGetObj(....) "layoutName" "layout")

(

...

( BooleanInput       nil )

)

let( () .... )) ;end pcDefinePCell

Then, I go to call the p-cell elsewhere, and pass in the BooleanInput to be true: 

dbCreateParamInst( ...

list(

...

list("BooleanInput"     "boolean"     t)

...

)

) ; end dbCreateParamInst

However, the BooleanInput is always set to the default value defined in the p-cell definition -- in this case nil. Are boolean arguments allowed? 

Thanks,

Mark