https://stackoverflow.com/questions/23645680
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RussianYes it is possible to turn off virtualization.
I had exactly the same problem as you - this custom style turns off virtualization and works like a charm:
<Style x:Key="NonVirtualizingDataGridStyle" TargetType="sdk:DataGrid">
<Setter Property="RowBackground" Value="#EBEBED" />
<Setter Property="AlternatingRowBackground" Value="#EBEBED" />
<Setter Property="RowHeight" Value="25" />
<Setter Property="GridLinesVisibility" Value="All"/>
<Setter Property="HeadersVisibility" Value="Column" />
<Setter Property="HorizontalGridLinesBrush" Value="#A0A0A0" />
<Setter Property="HorizontalScrollBarVisibility" Value="Auto" />
<Setter Property="VerticalScrollBarVisibility" Value="Auto" />
<Setter Property="SelectionMode" Value="Single" />
<Setter Property="CanUserReorderColumns" Value="False" />
<Setter Property="CanUserResizeColumns" Value="False" />
<Setter Property="CanUserSortColumns" Value="True" />
<Setter Property="AutoGenerateColumns" Value="True" />
<Setter Property="RowDetailsVisibilityMode" Value="VisibleWhenSelected" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="sdk:DataGrid">
<Grid>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal" />
<VisualState x:Name="Disabled">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="DisabledVisualElement" Storyboard.TargetProperty="Opacity" Duration="0" To="1" />
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Border BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}" CornerRadius="2">
<Grid x:Name="Root" Background="{TemplateBinding Background}">
<Grid.Resources>
<!--Start: TopLeftHeaderTemplate-->
<ControlTemplate x:Key="TopLeftHeaderTemplate" TargetType="sdk:DataGridColumnHeader">
<Grid x:Name="Root">
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Border BorderThickness="0,0,1,0" BorderBrush="#FFC9CACA" Background="#FF1F3B53" Grid.RowSpan="2">
<Rectangle Stretch="Fill" StrokeThickness="1">
<Rectangle.Fill>
<LinearGradientBrush StartPoint=".7,0" EndPoint=".7,1">
<GradientStop Color="#FCFFFFFF" Offset="0.015" />
<GradientStop Color="#F7FFFFFF" Offset="0.375" />
<GradientStop Color="#E5FFFFFF" Offset="0.6" />
<GradientStop Color="#D1FFFFFF" Offset="1" />
</LinearGradientBrush>
</Rectangle.Fill>
</Rectangle>
</Border>
<Rectangle VerticalAlignment="Bottom" Width="Auto" StrokeThickness="1" Height="1" Fill="#FFDBDCDC" Grid.RowSpan="2" />
</Grid>
</ControlTemplate>
<!--End: TopLeftHeaderTemplate-->
<!--Start: TopRightHeaderTemplate-->
<ControlTemplate x:Key="TopRightHeaderTemplate" TargetType="sdk:DataGridColumnHeader">
<Grid x:Name="RootElement">
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Border BorderThickness="1,0,0,0" BorderBrush="#FFC9CACA" Background="#FF1F3B53" Grid.RowSpan="2">
<Rectangle Stretch="Fill">
<Rectangle.Fill>
<LinearGradientBrush StartPoint=".7,0" EndPoint=".7,1">
<GradientStop Color="#FCFFFFFF" Offset="0.015" />
<GradientStop Color="#F7FFFFFF" Offset="0.375" />
<GradientStop Color="#E5FFFFFF" Offset="0.6" />
<GradientStop Color="#D1FFFFFF" Offset="1" />
</LinearGradientBrush>
</Rectangle.Fill>
</Rectangle>
</Border>
</Grid>
</ControlTemplate>
<!--End: TopRightHeaderTemplate-->
</Grid.Resources>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<!-- Fill up the space in the header above the vertical scroll bar -->
<Grid Grid.Column="1">
<Grid.RowDefinitions>
<RowDefinition Height="0.5*" />
<RowDefinition Height="0.5*" />
</Grid.RowDefinitions>
<!--<Rectangle x:Name="BackgroundGradient" Stretch="Fill" Fill="#FF79C1C0" Grid.RowSpan="2"/>
<Rectangle x:Name="BackgroundGradient_Copy" Fill="#6BFFFFFF" VerticalAlignment="Stretch" Grid.RowSpan="1"/>-->
<Rectangle x:Name="BackgroundGradient" Stretch="Fill"
Fill="{StaticResource CustomRed}" Grid.ColumnSpan="2"
Grid.RowSpan="2" />
<Border BorderBrush="Transparent"
BorderThickness="1,1,1,1"
Grid.ColumnSpan="3" Grid.RowSpan="3">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="0.5*"/>
<RowDefinition Height="0.5*"/>
</Grid.RowDefinitions>
<!--dark-->
<Border HorizontalAlignment="Stretch"
Margin="0,0,0,0" x:Name="dark"
Width="Auto" Grid.ColumnSpan="3"
Grid.RowSpan="3"
Background="#66000000"
Opacity="0"/>
<!--glow-->
<Border Opacity="0"
HorizontalAlignment="Stretch" x:Name="glow"
Width="Auto" Grid.RowSpan="2"
Grid.ColumnSpan="3">
<Border.Background>
<RadialGradientBrush>
<RadialGradientBrush.RelativeTransform>
<TransformGroup>
<ScaleTransform ScaleX="1.7"
ScaleY="2.2"/>
<SkewTransform AngleX="0"
AngleY="0"/>
<RotateTransform Angle="0"/>
<TranslateTransform X="-0.3"
Y="-0.1"/>
</TransformGroup>
</RadialGradientBrush.RelativeTransform>
<GradientStop Color="#B2FFFFFF"
Offset="0"/>
<GradientStop Color="#00FFFFFF"
Offset="1"/>
</RadialGradientBrush>
</Border.Background>
</Border>
<!--shine-->
<Border HorizontalAlignment="Stretch"
Margin="0,0,0,0" x:Name="shine"
Width="Auto"
Grid.ColumnSpan="3">
<Border.Background>
<LinearGradientBrush EndPoint="0.5,0.9"
StartPoint="0.5,0.1">
<GradientStop Color="#99FFFFFF"
Offset="0"/>
<GradientStop Color="#33FFFFFF"
Offset="1"/>
</LinearGradientBrush>
</Border.Background>
</Border>
</Grid>
</Border>
</Grid>
<sdk:DataGridColumnHeader x:Name="TopLeftCornerHeader" Template="{StaticResource TopLeftHeaderTemplate}" Width="22" />
<sdk:DataGridColumnHeadersPresenter Grid.Column="1" x:Name="ColumnHeadersPresenter" HorizontalAlignment="Left"/>
<sdk:DataGridColumnHeader x:Name="TopRightCornerHeader" Grid.Column="2" Template="{StaticResource TopRightHeaderTemplate}" />
<Rectangle x:Name="ColumnHeadersAndRowsSeparator" Grid.ColumnSpan="3" VerticalAlignment="Bottom" Width="Auto" StrokeThickness="1" Height="1" Fill="#FFC9CACA"/>
<ScrollViewer Style="{StaticResource RowScrollViewerStyle}" Grid.ColumnSpan="2" Grid.Row="1" Padding="0" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Disabled" >
<sdk:DataGridRowsPresenter x:Name="RowsPresenter" />
</ScrollViewer>
<Rectangle x:Name="BottomRightCorner" Fill="#FFE9EEF4" Grid.Column="2" Grid.Row="2" />
<Rectangle x:Name="BottomLeftCorner" Fill="#FFE9EEF4" Grid.Row="2" Grid.ColumnSpan="2" />
<Grid Grid.Column="1" Grid.Row="2">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<Rectangle x:Name="FrozenColumnScrollBarSpacer" />
<!--<local:Navigator Margin="4,0,2,0" />-->
<ScrollBar x:Name="HorizontalScrollbar" Grid.Column="1" Orientation="Horizontal" Height="18" Margin="-1,0,-1,-1" />
</Grid>
</Grid>
</Border>
<Border x:Name="DisabledVisualElement" IsHitTestVisible="False" Height="Auto" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Width="Auto" CornerRadius="2" Background="#8CFFFFFF" Opacity="0"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
There is a more simple style used to turn off virtualization but the one above has modifications to freeze the grid headers. I have just dumped the style that i use, you may want to remove the styling - but the functionality is there.
This style will solve your 2 points.
