When I first created a demo project for Silverlight 5, I opened the XAML code to start editing. I started typing "DockPanel" but then I noticed that intellisense didn't show anything. It turns out that DockPanel and some other controls aren't included in the default installation of Silverlight 4 or Silverlight 5 beta.
Here's what you need to do:
Download the Silverlight 4 Toolkit. Install it. (Yes, this will work with Silverlight 5 beta)
Add a reference to "System.Windows.Controls.Toolkit". In Silverlight 5, you will need to navigate to the file: %ProgramFiles%\Microsoft SDKs\Silverlight\v4.0\Toolkit\Apr10\Bin\System.Windows.Controls.Toolkit.dll
Add the following attribute to your UserControl: xmlns:tk="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Toolkit"
So your code might look like:
<UserControl x:Class="Project1.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:tk="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Toolkit" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400"> <Grid x:Name="LayoutRoot" Background="White"> <tk:DockPanel> </tk:DockPanel> </Grid> </UserControl>
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