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    <p>I was looking for a similar solution. I needed a group box style where the border was closed only when there is no header text. </p> <p>I'm not convinced it's the nicest solution, but it works fine...</p> <p>We have a converter (works with text only atm):</p> <pre><code>public class GroupBoxHeaderVisibilityConverter : IMultiValueConverter { #region IMultiValueConverter Members public object Convert(object[] values, System.Type targetType, object parameter, System.Globalization.CultureInfo culture) { ContentPresenter header = values[0] as ContentPresenter; if (header != null) { string text = header.Content as string; if (string.IsNullOrEmpty(text)) { return 0.0; } } return values[1]; } public object[] ConvertBack(object value, System.Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture) { throw new System.NotImplementedException(); } #endregion } </code></pre> <p>and the modifications to the groupbox style:</p> <pre><code>&lt;Border x:Name="Header" Grid.Column="1" Grid.Row="0" Grid.RowSpan="2" Padding="3,1,3,0"&gt; &lt;Border.Tag&gt; &lt;MultiBinding Converter="{StaticResource GroupBoxHeaderVisibilityConverter}"&gt; &lt;Binding Path="Content" ElementName="groupBoxLabel" /&gt; &lt;Binding Path="ActualWidth" RelativeSource="{RelativeSource Self}" /&gt; &lt;/MultiBinding&gt; &lt;/Border.Tag&gt; &lt;Label x:Name="groupBoxLabel" FontSize="{StaticResource Fonts_SmallFontSize}" Foreground="{TemplateBinding Foreground}"&gt; &lt;ContentPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" ContentSource="Header" RecognizesAccessKey="True" /&gt; &lt;/Label&gt; &lt;/Border&gt; &lt;ContentPresenter Margin="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" Grid.Column="1" Grid.ColumnSpan="2" Grid.Row="2" /&gt; &lt;Border Grid.ColumnSpan="4" Grid.Row="1" Grid.RowSpan="3" BorderBrush="Transparent" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="4"&gt; &lt;Border.OpacityMask&gt; &lt;MultiBinding Converter="{StaticResource BorderGapMaskConverter}" ConverterParameter="7"&gt; &lt;Binding ElementName="Header" Path="Tag" /&gt; &lt;Binding Path="ActualWidth" RelativeSource="{RelativeSource Self}" /&gt; &lt;Binding Path="ActualHeight" RelativeSource="{RelativeSource Self}" /&gt; &lt;/MultiBinding&gt; &lt;/Border.OpacityMask&gt; &lt;Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="3" /&gt; &lt;/Border&gt; </code></pre>
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