papervision3d null object exception

hi,
i’m having some problems with getting the mouseRelease event from papervision3d 1.5

when i click the object i can get the reference to the object by the parameter passed to the function

private function handleMousePress(e:InteractiveScene3DEvent):void
{
var obj = e.displayObject3D;
obj.pick = true;
}

so, the object that i’m using is a custom class that extends the Plane class that has an attribute called pick (actually it is getter/setter method to acces the private attribute _pick)

so, for the MousePress Event, if i try to access the attribute direct from the e.displayObject3D it throws an error, but if i put it on a variable and then use the variable to reach the pick attribute, then i’m ok.

but for the MouseRelease event, it just doesn’t work, it throws an error saying that there is a null reference to the object.

private function handleMouseRelease(e:InteractiveScene3DEvent):void
{
var obj = e.displayObject3D;
trace(obj.pick)
}

does anyone knows what’s wrong?