ajaxcontroltoolkit collapsiblepanelextender

How to determine the collapsed state of the AjaxControlToolkit CollapsiblePanelExtender in code-behind?

cpe.Collapsed seems to be always set to the initial state and not reflect the current state. Is there a direct way to determine on the server if the panel is collapsed?

Solution

if (cpe.ClientState == "true") // panel is collapsed.

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