@Override
	public boolean isMoveDownAllowed() {
		return (isContiguousSelection() &&
			(selection.getFieldRange(0).getEnd().getIndex().intValue() < getNumComponents()));
	}
Returns whether the selected component(s) can be moved down (to the next higher index).
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/compositeeditor/CompEditorModel.java