Localizing Xceed DataGrid

I am trying to find a way how to localize or remove "items" text in Xceed DataGrid for WPF (Community version), which is displayed automatically. Anybody knows how to do it?

Your issue is caused by the "items" label that is hardcoded in the Group's DataTemplate.

So the solution is to overwrite that DataTemplate. It is not so difficult if you use implicit data templating: just put your DataTemplate in the resources of the window with the DataGridControl:

<Window x:Class="Sample.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:toolkit="http://schemas.xceed.com/wpf/xaml/toolkit"
        xmlns:xcdg="http://schemas.xceed.com/wpf/xaml/datagrid"
        Title="MainWindow" Height="400" Width="400">


    <Window.Resources>
        <xcdg:StringFormatMultiConverter x:Key="stringFormatMultiConverter" />

        <DataTemplate x:Key="customGroupTemplate">
            <StackPanel Orientation="Horizontal" VerticalAlignment="Center">
                <ContentPresenter VerticalAlignment="Center" Content="{Binding Title}" ContentTemplate="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=DataContext.TitleTemplate}" ContentTemplateSelector="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=DataContext.TitleTemplateSelector}" />
                <TextBlock Text=": " VerticalAlignment="Center" />
                <ContentPresenter VerticalAlignment="Center" ContentTemplate="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=DataContext.ValueTemplate}" ContentTemplateSelector="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=DataContext.ValueTemplateSelector}">
                    <ContentPresenter.Content>
                        <MultiBinding Converter="{StaticResource stringFormatMultiConverter}">
                            <Binding Path="Value" />
                            <Binding Path="DataContext.ValueStringFormat" RelativeSource="{RelativeSource TemplatedParent}" />
                            <Binding Path="DataContext.ValueStringFormatCulture" RelativeSource="{RelativeSource TemplatedParent}" />
                        </MultiBinding>
                    </ContentPresenter.Content>
                </ContentPresenter>
                <TextBlock Text=" (" VerticalAlignment="Center" />
                <TextBlock VerticalAlignment="Center" Text="{Binding ItemCount}" />
                <TextBlock Text=" " VerticalAlignment="Center" />
                <TextBlock Name="suffixRun" Text="položky" VerticalAlignment="Center" />
                <TextBlock Text=")" VerticalAlignment="Center" />
            </StackPanel>
            <DataTemplate.Triggers>
                <DataTrigger Value="1" Binding="{Binding ItemCount}">
                    <Setter TargetName="suffixRun" Property="TextBlock.Text" Value="položka" />
                </DataTrigger>
            </DataTemplate.Triggers>
        </DataTemplate>

        <DataTemplate DataType="{x:Type xcdg:Group}">
            <ContentControl Name="groupContentPresenter" Focusable="False" 
                            ContentTemplate="{StaticResource customGroupTemplate}" Content="{Binding}" />
        </DataTemplate>
    </Window.Resources>

I sniffed the default template with ILSpy, then I created my own one with the word "items" translated.

I hope it can help you.