How to align the column header to center in DataGrid

This block might help you:

<pre lang="HTML">
...
<DataGridTextColumn Header="Nombre"
Binding="{Binding Nombre}">
<DataGridTextColumn.HeaderStyle>
<Style TargetType="DataGridColumnHeader">
<Setter Property="HorizontalContentAlignment"
Value="Center" />
</Style>
</DataGridTextColumn.HeaderStyle>
...
</pre>