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• 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.