public void addRow(int index) {
		if (rows.size() <= 11) {
			rows.add(index, new Row());
			findWidth();
			formatMgr.modelChanged(this);
		}
		else {
			Msg.showWarn(this, null, "Too Many Rows", "Too Many Rows");
		}
	}
Adds new empty row at the given position.  The position must be in the
interval [0,numRows].
@exception IllegalArgumentException thrown if the position is outside the
interval [0,numRows].
Ghidra/Features/Base/src/main/java/ghidra/app/util/viewer/format/FieldFormatModel.java