WPF - Problems with XAMLPAD and my view on Avalon

I just noticed a number of disadvantages of using XAMLPAD.
1. First, whenever you type a markup like
<StackPanel> // you have to manually end </StackPanel> by yourself instead of the visual 
editor automatically does it for you.
2. No intellisense. :( However, you can write XAML in Visual Studio 2005, but you cannot see the output
on the fly except you press CTRL + F5 in the IDE.
I was hoping to leverage both software at the same time, say:
a) Write xaml markup in the XAMLPAD.
b) Once I am comfortable with the UI, since I can the UI generated on the fly.
c) I will copy this xaml and be used directly in my Avalon or WPF project in VS 2005.
3. It just does not understand Class attribute. Below is the syntax, and you will expect an error.
Snippets extracted from 
http://windowssdk.msdn.microsoft.com/library/default.asp?url=/library/en-us/wcp_
conceptual/html/521071e7-9081-4705-8b1c-57df963dcaa7.asp
<Page xmlns="http://schemas.microsoft.com/winfx/avalon/2005"
      xmlns:x="http://schemas.microsoft.com/winfx/xaml/2005"
      x:Class="QuickStart_4.Page1">
  <StackPanel>
    <Button HorizontalAlignment="Left"
            Width="100"
            Margin="10,10,10,10"
            Click="HandleClick"
            Name="Button1">Click Me</Button>
  </StackPanel>
</Page>
Error:
The 'http://schemas.microsoft.com/winfx/xaml/2005' namespace attribute named 'Class' is not 
valid when loading a Xaml file. Try compiling your Xaml. Line 3 Position 7
3. It does not understand events except it is compiled.
Error:
Events cannot be specified in a Xaml file unless it is to be compiled. Line 5 Position 13
4. Writing XAML code is pretty tiring. It is not an easy job. But I believe the new product by 
Microsoft; Sparkle will solve this issue. I saw a number of Sparkle demos in Zam3d website (check 
www.erain.com) 
IMHO, I believe in future software development, the graphic designers will use Microsoft Expression 
product to develop the User Interface, while the developer will just focus on the logic. 
Cheers.
Published Tuesday, October 18, 2005 11:08 PM by chuawenching