After mentioning the 'alrx'/'dlgx' resources that help
making alerts and other dialogs appearance compliant and, if
desired, moveable...

...Jamin added:

I think window frame/window hilite colour is WDEF specific
(The WDEF must apply it - like the old System 7
WDEF with coloured racing stripes)

Text colour /font/etc  is done with 'ictb' resources.

****
I should like to comment on the latter that with Appearance
'ictb' resources are outdated and no longer recommended by
Apple. Please be aware that, since Appearance, we are left
with a single type of dialog item, namely controls. And for
controls we are asked to use 'dftb' resources instead of
'ictb' resources (they are constructed similarly and there
is no ResEdit template for them as well :-( !). Presently,
however, the old dialog items and 'ictb' resources still
work well.

According to Apple the rather new 'alrx'/'dlgx'and 'dftb'
resources are again already on the "not recommended for new
developments"-list, because Apple wishes to get rid of
resources as soon as possible. I think that's why it is so
important to soon get FB-access to the new and hopefully
long living techniques such as NIB.
Thank you Robert Purves and David Cottrell for your efforts.

Best to all,

Herbie
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Munich/Bavaria