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

StackOverflow https://stackoverflow.com/questions/2189546

Question

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?

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Solution 

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