DataGrid styles - wpf

Question

vS 2008 with WPF toolkit installed and referenced.
In the Window1.xaml I added this line:
xmlns:my="http://schemas.microsoft.com/wpf/2008/toolkit"
It runs, grid displays with data, until I attempt to style the grid. I get an error when attempting to apply a style that centers the text. The error refers to App.xaml and is:
The type reference cannot find a public type named 'DataGridCell'. Line 9 Position 75.
My App.xaml
<Application x:Class="DataGridStyles.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
StartupUri="Window1.xaml">
<Application.Resources>
<Style x:Key="CenterCellStyle" TargetType="{x:Type DataGridCell}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type DataGridCell}">
<Grid Background="{TemplateBinding Background}">
<ContentPresenter HorizontalAlignment="Center"
VerticalAlignment="Center"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter Property="Background" Value="Transparent" />
<Setter Property="BorderBrush" Value="Transparent" />
<Setter Property="Foreground" Value="Black" />
</Trigger>
</Style.Triggers>
</Style>
</Application.Resources>
</Application>

Answer 1

If the datagrid is part of the WPF toolkit, you'll need to add that namespace in your App.xaml too (xmlns:my="http://schemas.microsoft.com/wpf/2008/toolkit").
Then, just change your TargetType="{x:Type DataGridCell}" to TargetType="{x:Type my:DataGridCell}"