xvalid or similar with krige.bayes()

Greetings:

I need to perform LOOCV for krige.bayes().  I want to compare the output 
of krige.bayes to the output of other interpolation methods. I can do 
LOOCV easily for other interpolation methods using xvalid() in geoR or 
krige.cv() in gstat but I cannot find any code examples that demonstrate 
how this can be done for a krige.bayes() object.

Any help would be greatly appreciated.

Thank you.

-Damian