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    copied!<p><strong>Edit</strong>: this a new answer; I left the old answer at the bottom.</p> <p>If you set Path=. in the CommandParameter you get the ContentPresenter as the object in the Command. At this point I still could not reference the Uid or Name of the Column. Thus I created DataGridTextColumnWithTag that inherits from DataGridTextColumn and I added a DependencyProperty called Tag. Now in OnDrilldownHeaderClicked I can determine the column clicked on in the Grid.</p> <p>Here is the DataTemplate in XAML:</p> <pre><code>&lt;Window.Resources&gt; &lt;c:CommandReference x:Key="DrilldownHeaderClickedReference" Command="{Binding DrilldownHeaderClicked}" /&gt; &lt;DataTemplate x:Key="ClickableHeaderTemplate"&gt; &lt;Button Content="{Binding}" Background="Transparent" Command="{StaticResource DrilldownHeaderClickedReference}" CommandParameter="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=.}" &gt; &lt;/Button&gt; &lt;/DataTemplate&gt; &lt;/Window.Resources&gt; </code></pre> <p>Here is the definition of the DataGrid Column in XAML:</p> <pre><code>&lt;Helpers:DataGridTextColumnWithTag Header="Extra Name" Tag="234" Width="SizeToCells" Binding="{Binding FinalName}" FontSize="20" HeaderTemplate="{StaticResource ResourceKey=ClickableHeaderTemplate}"&gt; &lt;/Helpers:DataGridTextColumnWithTag&gt; </code></pre> <p>Here is the new DataGrid column:</p> <pre><code>public class DataGridTextColumnWithTag : DataGridTextColumn { public DataGridTextColumnWithTag() : base() { } public string Tag { get { return (string)this.GetValue(TagProperty); } set { this.SetValue(TagProperty, value); } } public static readonly DependencyProperty TagProperty = DependencyProperty.Register( "Tag", typeof(string), typeof(DataGridTextColumnWithTag), new PropertyMetadata(string.Empty)); } </code></pre> <p>Here is Command Binding used to find the column clicked on:</p> <pre><code>public ICommand DrilldownHeaderClicked { get; set; } private void OnDrilldownHeaderClicked(object obj) { ContentPresenter cp = obj as ContentPresenter; if (cp != null) { DataGridColumnHeader tp = cp.TemplatedParent as DataGridColumnHeader; if ( tp != null ) { DataGridTextColumnWithTag column = tp.Column as DataGridTextColumnWithTag; if ( column != null ) { string tag = column.Tag; } } } } </code></pre> <p><strong>Note</strong>: this is the old answer. This code gets the column header, but is brittle if/when the Column name changes.</p> <p>The following DataTemplate gets me the Header of the column.<br> I then use the header to figure out the column.<br> Hopefully this gets you started.<br> If you can extend this solution please post your answer.</p> <pre><code>&lt;UserControl.Resources&gt; &lt;c:CommandReference x:Key="DrilldownHeaderClickedReference" Command="{Binding DrilldownHeaderClicked}" /&gt; &lt;DataTemplate x:Key="ClickableHeaderTemplate"&gt; &lt;Button x:Name="btn" Content="{Binding}" Background="Transparent" Command="{StaticResource DrilldownHeaderClickedReference}" CommandParameter="{Binding}" &gt; &lt;/Button&gt; &lt;/DataTemplate&gt; &lt;/UserControl.Resources&gt; </code></pre>
 

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