31.3. Understanding Routed Events

Properties are not the only .NET programming construct to be given a facelift in order to work well within the WPF API. The standard CLR event model has also been refined just a bit to ensure that events can be processed in a manner that is fitting for XAML's description of a tree of objects. Assume you have a new WPF Application project named WPFRoutedEvents. Now, update the XAML description of the initial window by adding the following <Button> control which defines some complex content:

<Button Name="btnClickMe" Height="75" Width = "250"
        Click ="btnClickMe_Clicked">
  <StackPanel Orientation ="Horizontal">
    <Label Height="50" FontSize ="20">Fancy Button!</Label>
    <Canvas Height ="50" Width ="100" >
    <Ellipse Name = "outerEllipse" Fill ="Green" Height ="25"
             Width ="50" Cursor="Hand" Canvas.Left="25" Canvas.Top="12"/>
    <Ellipse Name = "innerEllipse" Fill ="Yellow" Height = "15" Width ="36"
             Canvas.Top="17" Canvas.Left="32"/>
    </Canvas>
  </StackPanel>
</Button>