[RDi/WDSC-Plugin-Dev] Adding custom variables to Work With User Actions (ifs)

I have created a table representing IFS objects in one of my views.

I’ve extended SystemWorkWithUDAsAction to allow user actions on items in my
table.

I’ve also extended IFSUDActionSubsystem so I can process the items, and use
internalGetSubstitutionValue to fill in the pre-defined substitution
variables.


I now want to be able to provide my own substitution variables, in addition
to the pre-defined list of variables.



How can I add my own variables to the list on the Work With User Actions
panel (‘Insert variable….’ button) so the user knows that they're available
for use?

How can I get internalGetSubstitutionValue to recognize these substitution
variables?


Thanks in advace


Doug