[BioC] hexbin + pairs

[Terry Therneau]

I would like to do a pairs plot with hexbin panels.  The obvious guess
	splom(xmat, panel=panel.hexbin)
	
gives a cryptic message (or cryptic to me at least):

Error in downViewport.vpPath(vpPathDirect(name), strict, recording = recording) 
: 
  Viewport 'plot1.panel.1.1.off.vp' was not found

R version 2.6.1 (2007-11-26), 64 bit on an Intel server with CentOs
hexbin installed a few days ago

  I looked in the archives and the documentation, but didn't find anything.  I 
could still have overlooked something obvious of course.  Any help would be 
appreciated.
  
  	Terry Therneau
  	Mayo Clinic
  	therneau.terry at mayo.edu