Changing the background color for one or more columns in a Silverlight DataGrid

<Project ToolsVersion="3.5" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <PropertyGroup>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
    <ProductVersion>9.0.30729</ProductVersion>
    <SchemaVersion>2.0</SchemaVersion>
    <ProjectGuid>{6CC3F4C2-2639-432C-ADD4-DFC3DBE869A6}</ProjectGuid>
    <ProjectTypeGuids>{A1591282-1198-4647-A2B1-27E5FF5F6F3B};{fae04ec0-301f-11d3-bf4b-00c04f79efbc}</ProjectTypeGuids>
    <OutputType>Library</OutputType>
    <AppDesignerFolder>Properties</AppDesignerFolder>
    <RootNamespace>SilverlightDataGridCellBGColor</RootNamespace>
    <AssemblyName>SilverlightDataGridCellBGColor</AssemblyName>
    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
    <SilverlightApplication>true</SilverlightApplication>
    <SupportedCultures>
    </SupportedCultures>
    <XapOutputs>true</XapOutputs>
    <GenerateSilverlightManifest>true</GenerateSilverlightManifest>
    <XapFilename>SilverlightDataGridCellBGColor.xap</XapFilename>
    <SilverlightManifestTemplate>Properties\AppManifest.xml</SilverlightManifestTemplate>
    <SilverlightAppEntry>SilverlightDataGridCellBGColor.App</SilverlightAppEntry>
    <TestPageFileName>TestPage.html</TestPageFileName>
    <CreateTestPage>true</CreateTestPage>
    <ValidateXaml>true</ValidateXaml>
    <EnableOutOfBrowser>false</EnableOutOfBrowser>
    <OutOfBrowserSettingsFile>Properties\OutOfBrowserSettings.xml</OutOfBrowserSettingsFile>
    <UsePlatformExtensions>false</UsePlatformExtensions>
    <ThrowErrorsInValidation>true</ThrowErrorsInValidation>
    <LinkedServerProject>
    </LinkedServerProject>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
    <DebugSymbols>true</DebugSymbols>
    <DebugType>full</DebugType>
    <Optimize>false</Optimize>
    <OutputPath>Bin\Debug</OutputPath>
    <DefineConstants>DEBUG;TRACE;SILVERLIGHT</DefineConstants>
    <NoStdLib>true</NoStdLib>
    <NoConfig>true</NoConfig>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
    <DebugType>pdbonly</DebugType>
    <Optimize>true</Optimize>
    <OutputPath>Bin\Release</OutputPath>
    <DefineConstants>TRACE;SILVERLIGHT</DefineConstants>
    <NoStdLib>true</NoStdLib>
    <NoConfig>true</NoConfig>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
  </PropertyGroup>
  <ItemGroup>
    <Reference Include="System.Windows" />
    <Reference Include="mscorlib" />
    <Reference Include="system" />
    <Reference Include="System.Core" />
    <Reference Include="System.Net" />
    <Reference Include="System.Windows.Controls.Data, Version=2.0.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL" />
    <Reference Include="System.Xml" />
    <Reference Include="System.Windows.Browser" />
  </ItemGroup>
  <ItemGroup>
    <Compile Include="App.xaml.cs">
      <DependentUpon>App.xaml</DependentUpon>
    </Compile>
    <Compile Include="DataGridTextColumnExtended.cs" />
    <Compile Include="MainPage.xaml.cs">
      <DependentUpon>MainPage.xaml</DependentUpon>
    </Compile>
    <Compile Include="Properties\AssemblyInfo.cs" />
    <Compile Include="TestClass.cs" />
  </ItemGroup>
  <ItemGroup>
    <ApplicationDefinition Include="App.xaml">
      <SubType>Designer</SubType>
      <Generator>MSBuild:MarkupCompilePass1</Generator>
    </ApplicationDefinition>
    <Page Include="MainPage.xaml">
      <SubType>Designer</SubType>
      <Generator>MSBuild:MarkupCompilePass1</Generator>
    </Page>
  </ItemGroup>
  <ItemGroup>
    <None Include="Properties\AppManifest.xml" />
  </ItemGroup>
  <Import Project="$(MSBuildExtensionsPath32)\Microsoft\Silverlight\v3.0\Microsoft.Silverlight.CSharp.targets" />
  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
       Other similar extension points exist, see Microsoft.Common.targets.
  <Target Name="BeforeBuild">
  </Target>
  <Target Name="AfterBuild">
  </Target>
  -->
  <ProjectExtensions>
    <VisualStudio>
      <FlavorProperties GUID="{A1591282-1198-4647-A2B1-27E5FF5F6F3B}">
        <SilverlightProjectProperties />
      </FlavorProperties>
    </VisualStudio>
  </ProjectExtensions>
</Project>