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    <p>To remove the datagrid validation summary (question #2), extract the style using blend or reflector, stick it in a Style resource dict, and remove the validation summary control. </p> <p>Then reference the style in the datagrid declaration (Style={StaticResource DataGridOverrideStyle}). Here's the xaml for silverlight 4 if you don't have reflector or blend:</p> <pre><code>&lt;Style TargetType="local:DataGrid" x:Key="DataGridOverrideStyle"&gt; &lt;Setter Property="RowBackground" Value="#AAEAEFF4" /&gt; &lt;Setter Property="AlternatingRowBackground" Value="#00FFFFFF" /&gt; &lt;Setter Property="Background" Value="#FFFFFFFF" /&gt; &lt;Setter Property="HeadersVisibility" Value="Column" /&gt; &lt;Setter Property="HorizontalScrollBarVisibility" Value="Auto" /&gt; &lt;Setter Property="VerticalScrollBarVisibility" Value="Auto" /&gt; &lt;Setter Property="SelectionMode" Value="Extended" /&gt; &lt;Setter Property="CanUserReorderColumns" Value="True" /&gt; &lt;Setter Property="CanUserResizeColumns" Value="True" /&gt; &lt;Setter Property="CanUserSortColumns" Value="True" /&gt; &lt;Setter Property="AutoGenerateColumns" Value="True" /&gt; &lt;Setter Property="RowDetailsVisibilityMode" Value="VisibleWhenSelected" /&gt; &lt;Setter Property="BorderBrush"&gt; &lt;Setter.Value&gt; &lt;LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0"&gt; &lt;GradientStop Color="#FFA3AEB9" Offset="0"/&gt; &lt;GradientStop Color="#FF8399A9" Offset="0.375"/&gt; &lt;GradientStop Color="#FF718597" Offset="0.375"/&gt; &lt;GradientStop Color="#FF617584" Offset="1"/&gt; &lt;/LinearGradientBrush&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;Setter Property="BorderThickness" Value="1" /&gt; &lt;Setter Property="DragIndicatorStyle"&gt; &lt;Setter.Value&gt; &lt;!-- TODO: Change the TargetType to Control when the fix Jolt bugs 18719 is verified --&gt; &lt;Style TargetType="ContentControl"&gt; &lt;Setter Property="Foreground" Value="#7FFFFFFF" /&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;!-- TODO: Change the TargetType to Control when the fix Jolt bugs 18719 is verified --&gt; &lt;ControlTemplate TargetType="ContentControl"&gt; &lt;Grid&gt; &lt;VisualStateManager.VisualStateGroups&gt; &lt;VisualStateGroup x:Name="SortStates"&gt; &lt;VisualState x:Name="Unsorted" /&gt; &lt;VisualState x:Name="SortAscending"&gt; &lt;Storyboard&gt; &lt;DoubleAnimation Storyboard.TargetName="SortIcon" Storyboard.TargetProperty="Opacity" Duration="0" To="1.0"/&gt; &lt;/Storyboard&gt; &lt;/VisualState&gt; &lt;VisualState x:Name="SortDescending"&gt; &lt;Storyboard&gt; &lt;DoubleAnimation Storyboard.TargetName="SortIcon" Storyboard.TargetProperty="Opacity" Duration="0" To="1.0"/&gt; &lt;DoubleAnimation Storyboard.TargetName="SortIcon" Storyboard.TargetProperty="(RenderTransform).ScaleY" Duration="0" To="-.9"/&gt; &lt;/Storyboard&gt; &lt;/VisualState&gt; &lt;/VisualStateGroup&gt; &lt;/VisualStateManager.VisualStateGroups&gt; &lt;Rectangle x:Name="BackgroundRectangle" Stretch="Fill" Fill="#66808080" Grid.ColumnSpan="2" /&gt; &lt;Rectangle x:Name="BackgroundGradient" Stretch="Fill" Grid.ColumnSpan="2" Opacity="0" &gt; &lt;Rectangle.Fill&gt; &lt;LinearGradientBrush StartPoint=".7,0" EndPoint=".7,1"&gt; &lt;GradientStop Color="#FFFFFFFF" Offset="0.015" /&gt; &lt;GradientStop Color="#F9FFFFFF" Offset="0.375" /&gt; &lt;GradientStop Color="#E5FFFFFF" Offset="0.6" /&gt; &lt;GradientStop Color="#C6FFFFFF" Offset="1" /&gt; &lt;/LinearGradientBrush&gt; &lt;/Rectangle.Fill&gt; &lt;/Rectangle&gt; &lt;Grid HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Margin="{TemplateBinding Padding}"&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition/&gt; &lt;ColumnDefinition Width="Auto" /&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;ContentPresenter Content="{TemplateBinding Content}"/&gt; &lt;Path Grid.Column="1" Name="SortIcon" Fill="#7FFFFFFF" RenderTransformOrigin=".5,.5" HorizontalAlignment="Left" VerticalAlignment="Center" Opacity="0" Stretch="Uniform" Width="8" Margin="4,0,0,0" Data="F1 M -5.215,6.099L 5.215,6.099L 0,0L -5.215,6.099 Z "&gt; &lt;Path.RenderTransform&gt; &lt;ScaleTransform ScaleX=".9" ScaleY=".9" /&gt; &lt;/Path.RenderTransform&gt; &lt;/Path&gt; &lt;/Grid&gt; &lt;/Grid&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;Setter Property="DropLocationIndicatorStyle"&gt; &lt;Setter.Value&gt; &lt;Style TargetType="ContentControl"&gt; &lt;Setter Property="Background" Value="#FF3F4346"/&gt; &lt;Setter Property="Width" Value="2"/&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="ContentControl"&gt; &lt;Rectangle Fill="{TemplateBinding Background}" Width="{TemplateBinding Width}" Height="{TemplateBinding Height}"/&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;Setter Property="GridLinesVisibility" Value="Vertical" /&gt; &lt;Setter Property="HorizontalGridLinesBrush" Value="#FFC9CACA" /&gt; &lt;Setter Property="IsTabStop" Value="True" /&gt; &lt;Setter Property="VerticalGridLinesBrush" Value="#FFC9CACA" /&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="local:DataGrid"&gt; &lt;Grid&gt; &lt;VisualStateManager.VisualStateGroups&gt; &lt;VisualStateGroup x:Name="CommonStates"&gt; &lt;VisualState x:Name="Normal"/&gt; &lt;VisualState x:Name="Disabled"&gt; &lt;Storyboard&gt; &lt;DoubleAnimation Storyboard.TargetName="DisabledVisualElement" Storyboard.TargetProperty="Opacity" Duration="0" To="1"/&gt; &lt;/Storyboard&gt; &lt;/VisualState&gt; &lt;/VisualStateGroup&gt; &lt;/VisualStateManager.VisualStateGroups&gt; &lt;Border BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}" CornerRadius="2"&gt; &lt;Grid Name="Root" Background="{TemplateBinding Background}"&gt; &lt;Grid.Resources&gt; &lt;!--Start: TopLeftHeaderTemplate--&gt; &lt;ControlTemplate x:Key="TopLeftHeaderTemplate" TargetType="localprimitives:DataGridColumnHeader"&gt; &lt;Grid Name="Root"&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition/&gt; &lt;RowDefinition/&gt; &lt;RowDefinition Height="Auto" /&gt; &lt;/Grid.RowDefinitions&gt; &lt;Border BorderThickness="0,0,1,0" BorderBrush="#FFC9CACA" Background="#FF1F3B53" Grid.RowSpan="2"&gt; &lt;Rectangle Stretch="Fill" StrokeThickness="1"&gt; &lt;Rectangle.Fill&gt; &lt;LinearGradientBrush StartPoint=".7,0" EndPoint=".7,1"&gt; &lt;GradientStop Color="#FCFFFFFF" Offset="0.015" /&gt; &lt;GradientStop Color="#F7FFFFFF" Offset="0.375" /&gt; &lt;GradientStop Color="#E5FFFFFF" Offset="0.6" /&gt; &lt;GradientStop Color="#D1FFFFFF" Offset="1" /&gt; &lt;/LinearGradientBrush&gt; &lt;/Rectangle.Fill&gt; &lt;/Rectangle&gt; &lt;/Border&gt; &lt;Rectangle VerticalAlignment="Bottom" Width="Auto" StrokeThickness="1" Height="1" Fill="#FFDBDCDC" Grid.RowSpan="2"/&gt; &lt;/Grid&gt; &lt;/ControlTemplate&gt; &lt;!--End: TopLeftHeaderTemplate--&gt; &lt;!--Start: TopRightHeaderTemplate--&gt; &lt;ControlTemplate x:Key="TopRightHeaderTemplate" TargetType="localprimitives:DataGridColumnHeader"&gt; &lt;Grid Name="RootElement"&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition/&gt; &lt;RowDefinition/&gt; &lt;RowDefinition Height="Auto" /&gt; &lt;/Grid.RowDefinitions&gt; &lt;Border BorderThickness="1,0,0,0" BorderBrush="#FFC9CACA" Background="#FF1F3B53" Grid.RowSpan="2"&gt; &lt;Rectangle Stretch="Fill"&gt; &lt;Rectangle.Fill&gt; &lt;LinearGradientBrush StartPoint=".7,0" EndPoint=".7,1"&gt; &lt;GradientStop Color="#FCFFFFFF" Offset="0.015" /&gt; &lt;GradientStop Color="#F7FFFFFF" Offset="0.375" /&gt; &lt;GradientStop Color="#E5FFFFFF" Offset="0.6" /&gt; &lt;GradientStop Color="#D1FFFFFF" Offset="1" /&gt; &lt;/LinearGradientBrush&gt; &lt;/Rectangle.Fill&gt; &lt;/Rectangle&gt; &lt;/Border&gt; &lt;/Grid&gt; &lt;/ControlTemplate&gt; &lt;!--End: TopRightHeaderTemplate--&gt; &lt;/Grid.Resources&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="Auto" /&gt; &lt;RowDefinition/&gt; &lt;RowDefinition Height="Auto" /&gt; &lt;RowDefinition Height="Auto" /&gt; &lt;/Grid.RowDefinitions&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="Auto" /&gt; &lt;ColumnDefinition/&gt; &lt;ColumnDefinition Width="Auto" /&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;localprimitives:DataGridColumnHeader Name="TopLeftCornerHeader" Template="{StaticResource TopLeftHeaderTemplate}" Width="22" /&gt; &lt;localprimitives:DataGridColumnHeadersPresenter Name="ColumnHeadersPresenter" Grid.Column="1"/&gt; &lt;localprimitives:DataGridColumnHeader Name="TopRightCornerHeader" Grid.Column="2" Template="{StaticResource TopRightHeaderTemplate}" /&gt; &lt;Rectangle Name="ColumnHeadersAndRowsSeparator" Grid.ColumnSpan="3" VerticalAlignment="Bottom" Width="Auto" StrokeThickness="1" Height="1" Fill="#FFC9CACA"/&gt; &lt;localprimitives:DataGridRowsPresenter Name="RowsPresenter" Grid.ColumnSpan="2" Grid.Row="1" /&gt; &lt;Rectangle Name="BottomRightCorner" Fill="#FFE9EEF4" Grid.Column="2" Grid.Row="2" /&gt; &lt;Rectangle Name="BottomLeftCorner" Fill="#FFE9EEF4" Grid.Row="2" Grid.ColumnSpan="2" /&gt; &lt;ScrollBar Name="VerticalScrollbar" Orientation="Vertical" Grid.Column="2" Grid.Row="1" Width="18" Margin="0,-1,-1,-1"/&gt; &lt;Grid Grid.Column="1" Grid.Row="2"&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="Auto" /&gt; &lt;ColumnDefinition/&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;Rectangle Name="FrozenColumnScrollBarSpacer" /&gt; &lt;ScrollBar Name="HorizontalScrollbar" Grid.Column="1" Orientation="Horizontal" Height="18" Margin="-1,0,-1,-1"/&gt; &lt;/Grid&gt; &lt;!--&lt;dataInput:ValidationSummary Name="ValidationSummary" Grid.Row="3" Grid.ColumnSpan="3" MaxHeight="0" /&gt;--&gt; &lt;/Grid&gt; &lt;/Border&gt; &lt;Border x:Name="DisabledVisualElement" IsHitTestVisible="False" Height="Auto" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Width="Auto" CornerRadius="2" Background="#8CFFFFFF" Opacity="0"/&gt; &lt;/Grid&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; </code></pre>
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