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Describe the AccordionExtender control.

  •  The AccordionExtender control is almost same as the CollapsiblePanelExtender control. 
  •  It enables the grouping of multiple collapsible panels in a single control. 
  •  It also manages the collapsed and expanded state of every panel and one panel will expand at a time. 
  •  Using AccordionExtender control we can't expand two or more panels at a time.

However, we can click the header templates of particular panel to display the hidden contents.

  •  By default, one panel is always expanded in theAccordionExtender.