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2012-08-09T08:38:13.087
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<h3>Answer is to long for comment</h3> Arnaud Weil brought me on the right way: To access the Property 'IsAdministrator' in ViewModel from the Datatemplate, I gave the UserControl a Name e.g.: <pre><code><UserControl x:Class="blanked out" x:Name="this" </code></pre> Used the code from Arnaud with some modifications, to inherit the Binding to the ViewModel from UserControl <pre><code><UserControl.Resources> <BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/> <helper:NotBooleanToVisibilityConverter x:Key="NotBooleanToVisibilityConverter"/> <DataTemplate x:Key="myTemplate"> <Grid> <Grid Visibility="{Binding DataContext.IsAdministrator, ElementName=this, Converter={StaticResource BooleanToVisibilityConverter}}">  <TextBlock Background="Yellow" Margin="3" Text="ICH BIN ADMNIN; JUCHUUU" /> </Grid> <Grid Visibility="{Binding DataContext.IsAdministrator, ElementName=this, Converter={StaticResource NotBooleanToVisibilityConverter}}">  <Image Name="logo" Source="/blanked out" HorizontalAlignment="Center" VerticalAlignment="Center" /> </Grid> </Grid> </DataTemplate> </UserControl.Resources> </code></pre> And for the inverted BooleanToVisibilityConverter: <pre><code>using System; using System.Globalization; using System.Windows; using System.Windows.Data; namespace blankedout.Helper { [ValueConversion(typeof(bool), typeof(Visibility))] public class NotBooleanToVisibilityConverter:IValueConverter { public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { var boolValue = (bool)value; return !boolValue ? Visibility.Visible : Visibility.Hidden; } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { throw new NotImplementedException(); } } } </code></pre> Thanks once again to Arnaud Weil Regards
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