Where can I find the command written for the change of setting from del surf to keep surf in ruled option?
It is ... nowhere!
Altairians don't want others to customize panels so they dont provide documents
These are relevant commands:
set ItemNumber [hm_getitemnumber ruled 'mesh, keep surf']
set ItemOwner [hm_getitemowner ruled $ItemNumber]
hm_setpopup ruled $ItemOwner $ItemNumber
