return getAccessibleChild(r * getAccessibleColumnCount() + c);
TableCellRenderer cellRenderer = getCellRenderer(r, c); Component renderer = cellRenderer.getTableCellRendererComponent( JTable.this, getValueAt(r, c), isCellSelected(r, c), false, r, c); if (renderer instanceof Accessible) return (Accessible) renderer; return null;
    public Accessible getAccessibleAt(int r, int c)    {      return getAccessibleChild(r * getAccessibleColumnCount() + c);    }