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<Grid
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Grid.Resources>
<ControlTemplate x:Key="GridViewHeaderTemplate" TargetType="GridViewColumnHeader">
<Border Background="Black">
<ContentPresenter VerticalAlignment="{TemplateBinding VerticalContentAlignment}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" />
</Border>
</ControlTemplate>
<Style TargetType="GridViewColumnHeader">
<Setter Property="Foreground" Value="Orange"/>
<Setter Property="FontSize" Value="30"/>
<Setter Property="Template" Value="{StaticResource GridViewHeaderTemplate}"/>
</Style>
</Grid.Resources>
<ListView .../>
</Grid>