if (b) jPanelControl.remove(0);
if (b) { if (jPanelControl.getComponentCount() > 0) jPanelControl.remove(0); }
    public void setEnabled(boolean b) {        if (isMultipleContainer) {            jButtonAdd.setVisible(b);            for (Enumeration e = removeMapping.keys(); e.hasMoreElements();) {                JButton button = (JButton) e.nextElement();                button.setVisible(b);            }            if (b)                jPanelControl.remove(0);            else                jPanelControl.add(Box.createHorizontalStrut(CONTROL_WIDTH));        }        for (Enumeration e = vComponents.elements(); e.hasMoreElements();)            ((FormComponent) e.nextElement()).setEnabled(b);    }