AbstractButton button = FindButton(old);
AbstractButton button = findButton(old);
    public void setSelected(ButtonModel m, boolean b)    {    if ((sel != m || b) && (! b || sel == m))		return;	    if (b && sel != m)	    {	ButtonModel old = sel;	sel = m;	if (old != null)	  old.setSelected(false);	AbstractButton button = FindButton(old);	if (button != null)	  button.repaint();		    }    else if (!b && sel == m)      m.setSelected(true);    }