I understand. I will then make some changes to the template instead to get the tab html content where I want it.
I would like to have HTML text as an option field type, to allow BBCodes etc. in a custom field.
BBCodes doesn't work in short text or multiline text type.
Saving an entry from another tab than the main tab causes the labels and entry icon to disappear. Saving from the main tab works without problems.
I guess it's the same problem as this topic: Label werden regelmässig verschluckt