Occurs when an end-user opens the expand panel.
The Expanded event handler receives an argument of the ASPxClientEventArgs type.
End-users can expand and collapse a 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 expanded automatically because the browser window was resized, the Expanded event does not occur.
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