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How to: Find the Source Element in an Event Handler

This example shows how to find the source element in an event handler.

The following example shows a Click event handler that is declared in a code-behind file. When a user clicks the button that the handler is attached to, the handler changes a property value. The handler code uses the Source property of the routed event data that is reported in the event arguments to change the Width property value on the Source element.

<Button Click="HandleClick">Button 1</Button>
Private Sub HandleClick(ByVal sender As Object, ByVal e As RoutedEventArgs)
    'You must cast the object as a Button element, or at least as FrameworkElement, to set Width 
    Dim srcButton As Button
    srcButton = CType(e.Source, Button)
    srcButton.Width = 200
End Sub
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