It's hard to say without knowing specifics, but here's a DataGridTextColumn
that is centered:
<wpf:DataGridTextColumn Header="Name" Binding="{Binding Name}" IsReadOnly="True">
<wpf:DataGridTextColumn.CellStyle>
<Style>
<Setter Property="FrameworkElement.HorizontalAlignment" Value="Center"/>
</Style>
</wpf:DataGridTextColumn.CellStyle>
</wpf:DataGridTextColumn>
If you are using DataGridTextColumn you can use the following code snippet:
<Style TargetType="DataGridCell">
<Style.Setters>
<Setter Property="TextBlock.TextAlignment" Value="Center" />
</Style.Setters>
</Style>