Lost in realization space ...
With the table reference removed from the TableColumnExt it's necessary
to trigger column's size calculation "some" time after setting the
prototype. That's done in my patch via table.layoutColumns() - no
problem if doing so in code. But when loading the resource from a .jdnc,
it has to be done _after_ the columns are realized.
I suspect that would be done somewhere in the TableElement code but