@Override
	public int getHeightBelow() {
		if (heightBelow < 0) {
			heightBelow = 0;
			for (FieldElement fieldElement : fieldElements) {
				heightBelow = Math.max(heightBelow, fieldElement.getHeightBelow());
			}
		}
		return heightBelow;
	}
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