@Override
	public void clear() {
		setHeader(null);
		ListIterator<ArrayList<JComponent>> iter = rowComps.listIterator();
		while (iter.hasNext()) {
			ArrayList<JComponent> compList = iter.next();
			ListIterator<JComponent> compIter = compList.listIterator();
			while (compIter.hasNext()) {
				Component rowComp = compIter.next();
				rowPanel.remove(rowComp);
			}
			compList.clear();
		}
		rowComps.clear();
		rows.clear();
		rowTypes.clear();
		group = new ButtonGroup();
		columnCount = 1;
		rowPanel.validate();
		validate();
		invalidate();
	}
Removes header text for this panel and all table/row information.
It also sets the columnCount back to 1.
Ghidra/Features/Base/src/main/java/ghidra/app/merge/listing/VerticalChoicesPanel.java