firePropertyChange(COLUMN_HEADER_CHANGED_PROPERTY, old, h);
firePropertyChange("columnHeader", old, h);
  public void setColumnHeader(JViewport h)  {    JViewport old = columnHeader;    removeNonNull(old);    columnHeader = h;    addNonNull(h);    firePropertyChange(COLUMN_HEADER_CHANGED_PROPERTY, old, h);    sync();  }