[Maya-Python] virtual class not calling _preCreateVirtual function... why?

[Geordie Martinez]

Here is a simple example.
_preCreateVirtual is not being called in this virtual class. I can't
figure out why. Any insight?

-------CODE
import pymel.all as pm
class blahNode( pm.Transform):

    @classmethod
    def _preCreateVirtual(cls,  **kwargs ):
        print ' _preCreateVirtual '
        return kwargs

    @classmethod
    def _isVirtual( cls, obj, name ):
        """PyMEL code should not be used inside the callback, only API
and maya.cmds. """
        print '_isVirtual '


pm.factories.registerVirtualClass( blahNode,nameRequired=False)

loc = pm.spaceLocator()



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