With the help from Bratt at IRC channel, i think i've got a solution. instead of calling parent::__construct, i could just call eZDataType::__construct
Stupid question : how did you make sure the customEZPageType isused instead of the default class ? It usually is not very easy to override a kernel's datatype.
Cheers !
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Nicolas Pastorino
Director Community - eZ
Member of the Community Project Board