A C# WPF .NET 4.0 "DataGrid" with Persistent Controls in Cells

<UserControl x:Class="PersistDataGrid.Header"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             d:DesignWidth="144"
             PreviewMouseLeftButtonDown="UserControl_PreviewMouseLeftButtonDown"
             GotMouseCapture="UserControl_GotMouseCapture">
    <UserControl.Resources>
        <Style  x:Key="HeaderStyle" TargetType="{x:Type Border}">
            <Setter Property="Background" Value="{StaticResource DGP_Head_NormalBrush}"/>
            <Setter Property="BorderBrush" Value="{StaticResource DGP_Head_NormalBorderBrush}"/>
            <Style.Triggers>
                <Trigger Property="Border.IsMouseOver" Value="true">
                    <Setter Property = "Background" Value="{StaticResource DGP_Head_HighlightBrush}"/>
                    <Setter Property = "BorderBrush" Value="{StaticResource DGP_Head_HighlightBorderBrush}"/>
                </Trigger>
            </Style.Triggers>
        </Style>
        <Style  x:Key="NoArrowStyle" TargetType="{x:Type Path}">
            <Setter Property="Fill" Value="Transparent"/>
        </Style>
    </UserControl.Resources>
    <Grid>
        <Border Name="HeaderBorder" Style="{StaticResource HeaderStyle}" BorderThickness="1,0,0,1">
            <Label Name="Title"/>
        </Border>
        <Path Name="Arrow"/> 
    </Grid>
</UserControl>