deRegUserTriggers works only part of the time

Hi, im using deRegUserTriggers to run a skill procedure after a cell is opened

deRegUserTriggers("maskLayout" nil nil 'lg_PostInstallTrigger)

my lg_PostInstallTrigger run properly if i open the cell with "Layout L"

but doesn't run if i open with "Layout XL" , "Layout GXL" , "Layout CE"

 can anyone tell me why is that ?, and how can i make it run for all four (and only for them) ?

Thanks !