I need to assign an eventHandler to an object, in this way:
_Element.AddHandler(UIElement.MouseLeftButtonUpEvent,
new RoutedEventHandler(Vars.Digit), tr
Yes, you can find the method with Type.GetMethod, and the event with Type.GetEvent, then add a handler with EventInfo.AddEventHandler. It may be slightly fiddly - and there'll be a lot of places to put error handling - but it shouldn't be too hard. Don't forget to specify binding flags if you want to be able to bind non-public methods/events.