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POHow to hide wpf datagrid columns depending on a property
 

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    <p>I have the following WPF sample program:</p> <p>Xaml:</p> <pre><code>&lt;Window x:Class="AncestorArie.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"&gt; &lt;Window.Resources&gt; &lt;BooleanToVisibilityConverter x:Key="BoolToVis" /&gt; &lt;/Window.Resources&gt; &lt;Grid&gt; &lt;DataGrid AutoGenerateColumns="False" Name="Blumen" ItemsSource="{Binding Leaves}"&gt; &lt;DataGrid.Columns&gt; &lt;DataGridTextColumn Binding="{Binding Color}" Header="Farbe" Width="160" /&gt; &lt;DataGridTextColumn Binding="{Binding Size}" Header="Größe" Width="60" Visibility="{Binding Path=DataContext.Flag, RelativeSource={RelativeSource Findancestor, AncestorType={x:Type Window}}, Converter={StaticResource BoolToVis}}" /&gt; &lt;/DataGrid.Columns&gt; &lt;/DataGrid&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p>Code behind:</p> <pre><code>public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); Flowers rose = new Flowers(); rose.Leaves = new ObservableCollection&lt;Leaf&gt;(); rose.Flag = false; Leaf L1 = new Leaf(); L1.Color = "rot"; L1.Size = 3; rose.Leaves.Add(L1); Leaf L2 = new Leaf(); L2.Color = "gelb"; L2.Size = 2; rose.Leaves.Add(L2); this.DataContext = rose; } } </code></pre> <p>And the model classes are:</p> <pre><code>public class Leaf { public string Color { get; set; } public int Size { get; set; } } public class Flowers { public bool Flag { get; set; } public ObservableCollection&lt;Leaf&gt; Leaves { get; set; } } </code></pre> <p>As you can see, I want to hide the 2nd datagrid column, if the <code>Flag</code> property is set to false. But it doesn't work. I get the following binding error in the Visual Studio Output window:</p> <blockquote> <p>System.Windows.Data Error: 4 : Cannot find source for binding with reference 'RelativeSource FindAncestor, AncestorType='System.Windows.Window', AncestorLevel='1''. BindingExpression:Path=DataContext.Flag; DataItem=null; target element is 'DataGridTextColumn' (HashCode=44856655); target property is 'Visibility' (type 'Visibility')</p> </blockquote> <p>What is wrong in my code concerning the <code>Visibility</code> attribute?</p>
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