Occurs when an attachment is opening in the Attachments panel and allows you to manage the attachment opening behavior.
public event EventHandler<PdfFileAttachmentOpeningEventArgs> FileAttachmentOpening
Public Event FileAttachmentOpening As EventHandler(Of PdfFileAttachmentOpeningEventArgs)
The FileAttachmentOpening event handler receives an argument of the DevExpress.UI.Xaml.Controls.PdfFileAttachmentOpeningEventArgs type.
Set the e.Cancel event's property to true to prevent the attachment from loading. Set the e.Handled property to true to hide the Security Warning message box.