public event FilterPopupEventHandler ShowFilterPopup
Public Event ShowFilterPopup As FilterPopupEventHandler
The ShowFilterPopup event handler receives an argument of the DevExpress.UI.Xaml.Grid.FilterPopupEventArgs type.
The ShowFilterPopup event is raised before a column's filter dropdown is shown, allowing you to customize its filter items. For example, you can delete existing items and add new items with custom captions and filter values.