I'm trying to create a plugin that adds a tab full of fields to entry types but I can't seem to get it working. I tried
assembleLayout but that replaced all the fields with my new fields rather than adding a new tab to them.
I'm trying different combinations of
FieldLayoutTabModel->setFields() but that throws an error about a
fieldId property which leads me to believe I don't quite have the data types right. Any help would be appreciated.