Occurs before the FlyoutControl is opened and allows to cancel control opening.
The Opening event's data class is CancelEventArgs. The following properties provide information specific to this event:
|Cancel||Gets or sets a value indicating whether the event should be canceled.|
To prevent a FlyoutControl from being opened, set the event's Cancel parameter to true, or set the FlyoutBase.StaysOpen property to false. After a flyout control is opened, the FlyoutBase.Opened event fires.