@Override
	public int getHeightAbove() {
		if (heightAbove < 0) {
			heightAbove = 0;
			for (FieldElement fieldElement : fieldElements) {
				heightAbove = Math.max(heightAbove, fieldElement.getHeightAbove());
			}
		}
		return heightAbove;
	}
A FieldElement that is composed of other FieldElements.  The elements are laid out horizontally.
Ghidra/Framework/Docking/src/main/java/docking/widgets/fieldpanel/field/CompositeFieldElement.java