code: public CollapsiblePanel addToAccordion(String title, JComponent component) 
      {
          return addToAccordion(title, component, false);
      }
docs: Add the given component to this accordion, wrapping it into a
  collapsible panel with the given title.
  
  @param title The title
  @param component The component to add
  @return The collapsible panel that has been created internally