Occurs after the focused cell's editor has been shown.
public event EditorEventHandler ShownEditor
Public Event ShownEditor As EditorEventHandler
The ShownEditor event handler receives an argument of the DevExpress.UI.Xaml.Grid.EditorEventArgs type.
When an end-user activates a cell within a column with a custom template, the ShownEditor event is not raised. Since the GridControlBase.HiddenEditor event is not raised either, the DataControlBase.ActiveEditor property value always stays null.