Atualmente, estou tentando implementar uma janela com estilo Metro.
Então eu fiz os seguintes estilos dentro de um ResourceDictionary:

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

<!-- Brushes -->
<SolidColorBrush x:Key="BackgroundColor" Color="#FFFFFFFF" />

<!-- Buttons -->
<Style x:Key="MetroControlBoxButton" TargetType="Button">
    <Setter Property="Background" Value="{StaticResource BackgroundColor}" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="Button">
                <ContentPresenter />
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

<!-- Windows -->
<Style x:Key="MetroWindow" TargetType="Window">
    <Setter Property="UseLayoutRounding" Value="True" />
    <Setter Property="WindowStyle" Value="None" />
    <Setter Property="ResizeMode" Value="NoResize" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="Window">
                <Grid Background="{StaticResource BackgroundColor}">
                    <Grid.RowDefinitions>
                        <RowDefinition Height="6" />
,                        <RowDefinition Height="24" />
                        <RowDefinition Height="*" />
                        <RowDefinition Height="24" />
                        <RowDefinition Height="6" />
                    </Grid.RowDefinitions>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="6" />
                        <ColumnDefinition Width="*" />
                        <ColumnDefinition Width="6" />
                    </Grid.ColumnDefinitions>

                    <Rectangle Name="topLeftBorderRectangle" Fill="Red" Grid.Row="0" Grid.Column="0" />
                    <Rectangle Name="topCenterBorderRectangle" Fill="Orange" Grid.Row="0" Grid.Column="1" />
                    <Rectangle Name="topRightBorderRectangle" Fill="Red" Grid.Row="0" Grid.Column="2" />
                    <Rectangle Name="middleLeftBorderRectangle" Fill="Orange" Grid.Row="1" Grid.RowSpan="3" Grid.Column="0" />
                    <Rectangle Name="middleRightBorderRectangle" Fill="Orange" Grid.Row="1" Grid.RowSpan="3" Grid.Column="2" />
                    <Rectangle Name="bottomLeftBorderRectangle" Fill="Red" Grid.Row="4" Grid.Column="0" />
                    <Rectangle Name="bottomCenterBorderRectangle" Fill="Orange" Grid.Row="4" Grid.Column="1" />
                    <Rectangle Name="bottomRightBorderRectangle" Fill="Red" Grid.Row="4" Grid.Column="2" />

                    <Rectangle Name="statusBarRectangle" Fill="Yellow" Grid.Row="3" Grid.Column="1" />

                    <Grid Grid.Row="1" Grid.Column="1">
                        <Grid.RowDefinitions>
                            <RowDefinition Height="*" />
                        </Grid.RowDefinitions>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="Auto" />
                            <ColumnDefinition Width="*"/>
                            <ColumnDefinition Width="28" />
                            <ColumnDefinition Width="28" />
                            <ColumnDefinition Width="28" />
                        </Grid.ColumnDefinitions>

                        <Rectangle Name="dragRectangle" Fill="Yellow" Grid.Row="0" Grid.Column="1" />
                        <Button Name="minimizeButton" Content="_" Grid.Row="0" Grid.Column="2" Style="{StaticResource MetroControlBoxButton}" Command="{Binding Path=DataContext.MinimizeCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}}" />
                        <Button Name="maximizeButton" Content="[]"  Grid.Row="0" Grid.Column="3" Style="{StaticResource MetroControlBoxButton}" Command="{Binding Path=DataContext.MaximizeNormalizeCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}}" />
                        <Button Name="closeButton" Content="X" Grid.Row="0" Grid.Column="4" Style="{StaticResource MetroControlBoxButton}" Command="{Binding Path=DataContext.CloseCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}}" />
                    </Grid>

                    <ContentPresenter Grid.Row="2" Grid.Column="1" />
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

</ResourceDictionary>

Meu problema é que não tenho idéia de como implementar o recurso de arrasta
My dragRectangle não tem uma propriedade Command, como posso chamar DragMove () em MouseLeftButtonDown em um retângulo usando MVVM?

Obrigad