Java2Demo throws Null exceptions when onscreen rendering is enabled and
you choose a new demo panel. I won't bother putting down a particular null
exception instance, because the errors are different depending on which panel
you switch to.

To reproduce:
run Java2Demo
select the Arcs_Curves panel
select "On Screen" rendering (instead of the default "auto screen")
select the Clipping panel (or any other panel)
Observe the scrolling exceptions in your command shell

This has been reproduced on multiple Windows systems under 1.3 (builds r and
v) and 1.4 (latest as of 6/9/00). It has not yet been tested under Solaris.

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This bug has now also been reproduced under Solaris...

chet.haase@Eng 2000-06-14