Oh yes, it works!

Avalon, XAML, and Windows Forms

Using any rev of XamlPad, you can paste the following XAML into the window and see Avalon and Windows Forms components interoperability. Wahoo! I added a new snippet to XamlPad rev 8 that is this sample. If you have a current version of XamlPad, just delete the snippets.xml file from your My Documents\XamlPad directory and XamlPad will automatically recreate the file. I should probably add a feature to recreate this file. Check this out:

<?Mapping XmlNamespace="windowsforms" ClrNamespace="System.Windows.Forms" Assembly="System.Windows.Forms" ?>
<?Mapping XmlNamespace="windowsformsintegration" ClrNamespace="System.Windows.Forms.Integration" Assembly="WindowsFormsIntegration" ?>
<Grid xmlns="http://schemas.microsoft.com/2003/xaml" xmlns:x="Definition"
  xmlns:wf="windowsforms"
  xmlns:wfi="windowsformsintegration">

<Grid>
 <Grid.ColumnDefinitions>
  <ColumnDefinition Width="*" />
  <ColumnDefinition Width="*" />
 </Grid.ColumnDefinitions>
 <Grid.RowDefinitions>
  <RowDefinition Height="*" />
  <RowDefinition Height="*" />
 </Grid.RowDefinitions>
  <Button Grid.Row="1">Hello From Avalon</Button>
  <Canvas Grid.Column="1" >
  <Ellipse Width="50" Height="50">
   <Canvas.Top><LengthAnimation From="0" To="100" Duration="8" AutoReverse="True" RepeatDuration="Indefinite" /></Canvas.Top>
   <Canvas.Left><LengthAnimation From="0" To="200" Duration="2" AutoReverse="True" RepeatDuration="Indefinite" /></Canvas.Left>
   <Ellipse.Fill>
<LinearGradientBrush><LinearGradientBrush.GradientStops><GradientStop Offset="0" Color="#FFFFFFFF" /><GradientStop Offset=".33" Color="#FFFF0000" /><GradientStop Offset=".66" Color="#FF00FF00" /><GradientStop Offset="1" Color="#FF0000FF" /></LinearGradientBrush.GradientStops></LinearGradientBrush>
   </Ellipse.Fill>
  </Ellipse>
 </Canvas>
  <wfi:WindowsFormsHost Grid.Row="1" Grid.Column="1">
   <wf:Button Text="Hello From Windows Forms" />
  </wfi:WindowsFormsHost>
  <wfi:WindowsFormsHost>
   <wf:TreeView>
    <wf:TreeView.Nodes>
      <wf:TreeNode Text="Hello">
        <wf:TreeNode.Nodes>
          <wf:TreeNode Text="Hello" />
          <wf:TreeNode Text="Hello" />
          <wf:TreeNode Text="Hello" />
          <wf:TreeNode Text="Hello" />
        </wf:TreeNode.Nodes>
      </wf:TreeNode>
      <wf:TreeNode Text="Hello" />
      <wf:TreeNode Text="Hello" />
      <wf:TreeNode Text="Hello" />
      <wf:TreeNode Text="Hello" />
    </wf:TreeView.Nodes>
    
   </wf:TreeView>
  </wfi:WindowsFormsHost>
</Grid>

</Grid>