title: How to use the Click event in a GridViewColumn
body: <p>In WPF, how can you fire an event when a GridViewColumn is clicked?</p>
  
  <p>I have many <code>GridViewColumns</code> like this; i want, when user clicks on it, show an update form to update some data.
  How i can do that? </p>
  
  <pre><code>        &lt;GridViewColumn util:GridViewSort.PropertyName="Username" &gt;
              &lt;GridViewColumn.HeaderTemplate&gt;
                  &lt;DataTemplate&gt;
                      &lt;Label Width="130" Height="25" Margin="10,0,0,0" HorizontalAlignment="Left" VerticalAlignment="Center" Content="Username" Foreground="Black" /&gt;
                  &lt;/DataTemplate&gt;
              &lt;/GridViewColumn.HeaderTemplate&gt;
              &lt;GridViewColumn.CellTemplate&gt;
                  &lt;DataTemplate&gt;
                      &lt;Grid&gt;
                          &lt;Label Height="30" Margin="7,0,0,0" HorizontalAlignment="left" VerticalAlignment="Center" Content="{Binding Path=Username}" Foreground="Black" /&gt;
                      &lt;/Grid&gt;
                  &lt;/DataTemplate&gt;
              &lt;/GridViewColumn.CellTemplate&gt;
          &lt;/GridViewColumn&gt;
  </code></pre>