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    copied!<p>At first glance, your code is normal, should work. But when your dependency property is set to <code>DataGridTextColumn</code>, <code>SetUnit</code> not called and the variable <code>Unit</code> value <code>NULL</code>. I tried to assign a value of attached dependency property in <code>Window</code> (since it attached, you can set its value anywhere) in this case must work:</p> <pre><code>&lt;Window x:Class="DataGridAttachedHelp.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:DataGridAttachedHelp" local:CustomHeader.Unit="[m/s]" Name="MyWindow" Title="MainWindow" Height="350" Width="525" WindowStartupLocation="CenterScreen"&gt; &lt;Grid&gt; &lt;DataGrid x:Name="tObjectDataGrid" Margin="10,50,10,10" AutoGenerateColumns="False" EnableRowVirtualization="True" RowDetailsVisibilityMode="VisibleWhenSelected" &gt; &lt;DataGrid.Resources&gt; &lt;DataTemplate x:Key="CustomHeaderTemplate"&gt; &lt;StackPanel&gt; &lt;TextBlock Text="{Binding}" /&gt; &lt;TextBlock Text="{Binding Path=(local:CustomHeader.Unit), ElementName=MyWindow}" /&gt; &lt;/StackPanel&gt; &lt;/DataTemplate&gt; &lt;/DataGrid.Resources&gt; &lt;DataGrid.Columns&gt; &lt;DataGridTextColumn x:Name="SpeedColumn" Width="1*" Binding="{Binding Speed}" Header="Speed" HeaderTemplate="{StaticResource CustomHeaderTemplate}" /&gt; &lt;/DataGrid.Columns&gt; &lt;/DataGrid&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p>In your case the property did not work, because it is necessary to indicate the source of the properties, for example: <code>ElementName</code>, <code>Source</code>. Therefore, simply add the name of <code>DataGridTextColumn</code> in parameter <code>ElementName</code>:</p> <pre><code>&lt;TextBlock Text="{Binding Path=(local:CustomHeader.Unit), ElementName=SpeedColumn}" /&gt; </code></pre>
 

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