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POXaml VS designer error: '{DependencyProperty.UnsetValue}'
 

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  1. POXaml VS designer error: '{DependencyProperty.UnsetValue}'
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    <p>I am building a custom tabitem using template binding. All is fine until I used binding on the margin to a custom value converter, then I get an error in the VS designer: '{DependencyProperty.UnsetValue}' is not a valid value for the 'System.Windows.Controls.Control.Template' property on a Setter.</p> <p>The converters are as follows:</p> <pre><code>public class ContentToMarginConverter : IValueConverter { #region IValueConverter Members public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { return new Thickness(0, 0, -((ContentPresenter)value).ActualHeight, 0); } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { throw new NotImplementedException(); } #endregion } public class ContentToPathConverter : IValueConverter { #region IValueConverter Members public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { var ps = new PathSegmentCollection(4); ContentPresenter cp = (ContentPresenter)value; double h = cp.ActualHeight &gt; 10 ? 1.4 * cp.ActualHeight : 10; double w = cp.ActualWidth &gt; 10 ? 1.25 * cp.ActualWidth : 10; ps.Add(new LineSegment(new Point(1, 0.7 * h), true)); ps.Add(new BezierSegment(new Point(1, 0.9 * h), new Point(0.1 * h, h), new Point(0.3 * h, h), true)); ps.Add(new LineSegment(new Point(w, h), true)); ps.Add(new BezierSegment(new Point(w + 0.6 * h, h), new Point(w + h, 0), new Point(w + h * 1.3, 0), true)); return ps; } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { throw new NotImplementedException(); } #endregion } </code></pre> <p>And the xaml template as follows:</p> <pre><code>&lt;Style TargetType="TabItem"&gt; &lt;Setter Property="SnapsToDevicePixels" Value="True"/&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="TabItem"&gt; &lt;Grid Name="grd"&gt; &lt;Path Name="tabPath" StrokeThickness="1" Stroke="{StaticResource ResourceKey=borderBrush}" Fill="{StaticResource ResourceKey=unselectedBrush}" Margin="{Binding ElementName=TabItemContent,Converter={StaticResource ResourceKey=content2Margin}}"&gt; &lt;Path.Data&gt; &lt;PathGeometry&gt; &lt;PathFigure IsClosed="False" StartPoint="1,0" Segments="{Binding ElementName=TabItemContent,Converter={StaticResource ResourceKey=content2Path}}"&gt; &lt;/PathFigure&gt; &lt;/PathGeometry&gt; &lt;/Path.Data&gt; &lt;Path.LayoutTransform&gt; &lt;ScaleTransform ScaleY="-1"/&gt; &lt;/Path.LayoutTransform&gt; &lt;/Path&gt; &lt;Rectangle Name="TabItemTopBorder" Height="2" Visibility="Visible" VerticalAlignment="Bottom" Margin="{Binding ElementName=TabItemContent, Converter={StaticResource ResourceKey=content2Margin}}" /&gt; &lt;ContentPresenter Name="TabItemContent" ContentSource="Header" Margin="10,2,10,2" VerticalAlignment="Center" TextElement.Foreground="White"/&gt; &lt;/Grid&gt; &lt;ControlTemplate.Triggers&gt; &lt;Trigger Property="IsMouseOver" Value="True" SourceName="grd"&gt; &lt;Setter Property="Stroke" Value="{StaticResource HoverBrush}" TargetName="tabPath"/&gt; &lt;/Trigger&gt; &lt;Trigger Property="Selector.IsSelected" Value="True"&gt; &lt;Setter Property="Fill" TargetName="tabPath" Value="{StaticResource ResourceKey=backgroundBrush}"/&gt; &lt;Setter Property="Panel.ZIndex" Value="2"/&gt; &lt;Setter Property="Visibility" Value="Hidden" TargetName="TabItemTopBorder"/&gt; &lt;Setter Property="TextElement.Foreground" TargetName="TabItemContent" Value="Black"/&gt; &lt;/Trigger&gt; &lt;/ControlTemplate.Triggers&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; </code></pre> <p>Any reason why I get this error in the designer, yet when I build the project is fine????</p>
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    1. COIt is not uncommon to have issues with the designer, but not at runtime. Is the issue with both of your custom IValueConverters, or just one of them?
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