<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/Some;component/Styles/Accents/Blue.xaml" />
</ResourceDictionary.MergedDictionaries>
<Style TargetType="Syncfusion:GridRowHeaderCell">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Syncfusion:GridRowHeaderCell">
<Border x:Name="PART_RowHeaderCellBorder"
Background="White"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}">
<Grid>
<!--RowIndex is displayed here -->
<TextBlock
Text="{Binding RowIndex,
RelativeSource={RelativeSource TemplatedParent}}"
TextAlignment="Center" />
</Grid>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ResourceDictionary>
</Application.Resources>
But it's not work......