> The popup will disappear as soon as you click somewhere else, so in theory as
> soon as you start moving the class tool, the popup will disappear.

On Solaris 9 on SPARC under CDE when I click on the Class tab and start moving it,
the popup does not disappear.  I think (not sure) that it does disappear
on Solaris 10 on x86 under JDS.  This problem might be specific to either
CDE or SPARC (more likely the former).