Occurs when the expanded panel is closed.
The Collapsed event handler receives an argument of the ASPxClientEventArgs type.
End-users can expand and collapse the expanded panel when the panel ASPxCollapsiblePanel.Collapsible property is set to true.
If the panel's ASPxCollapsiblePanel.Collapsible property is set to true and the panel was collapsed automatically because the browser window was resized, the Collapsed event does not occur.
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