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POWPF Error: Cannot find governing FrameworkElement for target element
 

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    <p>I've got a datagrid with a Row that has an image. This image is bound with a trigger to a certain state. When the state changes I want to change the image.</p> <p>The Template itself is set on the HeaderStyle of a DataGridTemplateColumn. This template has some bindings. The first binding Day shows what day it is and the State changes the image with a trigger.</p> <p>These properties are set in a ViewModel. </p> <p>Properties:</p> <pre><code>public class HeaderItem { public string Day { get; set; } public ValidationStatus State { get; set; } } this.HeaderItems = new ObservableCollection&lt;HeaderItem&gt;(); for (int i = 1; i &lt; 15; i++) { this.HeaderItems.Add(new HeaderItem() { Day = i.ToString(), State = ValidationStatus.Nieuw, }); } </code></pre> <p>Datagrid:</p> <pre><code>&lt;DataGrid x:Name="PersoneelsPrestatiesDataGrid" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" AutoGenerateColumns="False" SelectionMode="Single" ItemsSource="{Binding CaregiverPerformances}" FrozenColumnCount="1" &gt; &lt;DataGridTemplateColumn HeaderStyle="{StaticResource headerCenterAlignment}" Header="{Binding HeaderItems[1]}" Width="50"&gt; &lt;DataGridTemplateColumn.CellEditingTemplate&gt; &lt;DataTemplate&gt; &lt;TextBox Text="{ Binding Performances[1].Duration,Converter={StaticResource timeSpanConverter},Mode=TwoWay}"/&gt; &lt;/DataTemplate&gt; &lt;/DataGridTemplateColumn.CellEditingTemplate&gt; &lt;DataGridTemplateColumn.CellTemplate&gt; &lt;DataTemplate&gt; &lt;TextBlock TextAlignment="Center" Text="{ Binding Performances[1].Duration,Converter={StaticResource timeSpanConverter}}"/&gt; &lt;/DataTemplate&gt; &lt;/DataGridTemplateColumn.CellTemplate&gt; &lt;/DataGridTemplateColumn&gt; &lt;/DataGrid&gt; </code></pre> <p>Datagrid HeaderStyleTemplate:</p> <pre><code> &lt;Style x:Key="headerCenterAlignment" TargetType="{x:Type DataGridColumnHeader}"&gt; &lt;Setter Property="HorizontalContentAlignment" Value="Center"/&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="{x:Type DataGridColumnHeader}"&gt; &lt;Grid&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition /&gt; &lt;RowDefinition /&gt; &lt;/Grid.RowDefinitions&gt; &lt;TextBlock Grid.Row="0" Text="{Binding Day}" /&gt; &lt;Image x:Name="imageValidation" Grid.Row="1" Width="16" Height="16" Source="{StaticResource imgBevestigd}" /&gt; &lt;/Grid&gt; &lt;ControlTemplate.Triggers&gt; &lt;MultiDataTrigger &gt; &lt;MultiDataTrigger.Conditions&gt; &lt;Condition Binding="{Binding State}" Value="Nieuw"/&gt; &lt;/MultiDataTrigger.Conditions&gt; &lt;Setter TargetName="imageValidation" Property="Source" Value="{StaticResource imgGeenStatus}"/&gt; &lt;/MultiDataTrigger&gt; &lt;/ControlTemplate.Triggers&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; </code></pre> <p>Now when I startup the project the images doesn't show and I get this error:</p> <blockquote> <p>System.Windows.Data Error: 2 : Cannot find governing FrameworkElement or FrameworkContentElement for target element. BindingExpression:Path=HeaderItems[0]; DataItem=null; target element is 'DataGridTemplateColumn' (HashCode=26950454); target property is 'Header' (type 'Object')</p> </blockquote> <p>Why is this error showing?</p>
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