popup = (getInstances() != null);
popup = popup && (getInstances() != null);
  public void mouseClicked(MouseEvent e) {    int		col;    boolean	popup;        col   = m_TableArff.columnAtPoint(e.getPoint());    popup =    ((e.getButton() == MouseEvent.BUTTON3) && (e.getClickCount() == 1))            || ((e.getButton() == MouseEvent.BUTTON1) && (e.getClickCount() == 1) && e.isAltDown() && !e.isControlDown() && !e.isShiftDown());    popup = (getInstances() != null);        if (e.getSource() == m_TableArff.getTableHeader()) {      m_CurrentCol = col;            // Popup-Menu      if (popup) {        e.consume();        setMenu();        initPopupMenus();        m_PopupHeader.show(e.getComponent(), e.getX(), e.getY());      }    }    else if (e.getSource() == m_TableArff) {      // Popup-Menu      if (popup) {        e.consume();        setMenu();        initPopupMenus();        m_PopupRows.show(e.getComponent(), e.getX(), e.getY());      }    }        // highlihgt column    if (    (e.getButton() == MouseEvent.BUTTON1)           && (e.getClickCount() == 1)          && (!e.isAltDown())         && (col > -1) ) {      m_TableArff.setSelectedColumn(col);    }  }