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RadExpanderPreviewCollapsed Event
Occurs when the content will be Collapsed. If the event handler set True for the Handled property then the content will not collapse.

Namespace: Telerik.Windows.Controls
Assembly: Telerik.Windows.Controls (in Telerik.Windows.Controls.dll) Version: 2018.2.515.40 (2018.2.515.40)
Syntax
public event RadRoutedEventHandler PreviewCollapsed

Value

Type: Telerik.WindowsRadRoutedEventHandler
See Also