Sofa, AvalonDock and MEF

<Window x:Class="SofaBasicContainer.PerspectiveName"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="New perspective" WindowStyle="None"
    WindowStartupLocation="CenterOwner" BorderThickness="0"
    SizeToContent="WidthAndHeight" 
    >
<!-- d:DesignHeight="245" d:DesignWidth="358"-->
    
    <Border BorderBrush="Black" BorderThickness="2" Background="LightGray">
        <DockPanel Margin="0">
            <StackPanel Orientation="Vertical" HorizontalAlignment="Center" >
                <TextBlock Name="windowLabel" HorizontalAlignment="Left" Height="21" FontWeight="Bold" Margin="10,10,0,0" Width="262" />
                <StackPanel Orientation="Horizontal" HorizontalAlignment="Left">
                    <TextBlock x:Name="textForTemplatesList" Margin="10" Width="100"/>
                    <ComboBox x:Name="templatesList" Margin="10" Width="200" />
                    <TextBlock x:Name="oldName" Margin="10" Width="100"/>
                </StackPanel>
                <StackPanel Orientation="Horizontal" HorizontalAlignment="Left">
                    <TextBlock x:Name="textBlock1" Text="Perspective name:" Margin="10" Width="100"/>
                    <TextBox Name="Name" Margin="10" Width="200"/>
                </StackPanel>
                <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">
                    <Button Content="Ok" Click="ButtonYes_Click" DockPanel.Dock="Bottom" IsDefault="True" Width="75" Margin="10"/>
                    <Button Content="Cancel" Click="ButtonCancel_Click" DockPanel.Dock="Bottom" Width="75" Margin="10"/>
                </StackPanel>
            </StackPanel>

        </DockPanel>
    </Border>
</Window>