@Override
		public void stateChanged(ChangeEvent event) {
			setStatusText("");
			boolean ok = false;
			if (source == blockOneLengthField) {
				ok = blockOneLengthChanged();
			}
			else if (source == blockTwoLengthField) {
				ok = blockTwoLengthChanged();
			}
			setOkEnabled(ok);
		}
Listener on the RegisterField inputs; update other fields when either
of these fields change.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/memory/SplitBlockDialog.java