HandyControl/src/Shared/HandyControl_Shared/Themes/Styles/Base/GroupBoxBaseStyle.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:hc="clr-namespace:HandyControl.Controls">

    <ControlTemplate x:Key="GroupBoxBaseTopTemplate" TargetType="GroupBox">
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto" />
                <RowDefinition />
            </Grid.RowDefinitions>
            <Border MinHeight="{Binding Path=(hc:TitleElement.MinHeight), RelativeSource={RelativeSource TemplatedParent}}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}" Background="{Binding Path=(hc:TitleElement.Background),RelativeSource={RelativeSource TemplatedParent}}" CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" Margin="0,0,0,6">
                <ContentPresenter TextElement.Foreground="{TemplateBinding Foreground}" Margin="{Binding Path=(hc:TitleElement.Padding), RelativeSource={RelativeSource TemplatedParent}}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" ContentSource="Header" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
            </Border>
            <Border Grid.Row="1" CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}">
                <ContentPresenter Margin="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
            </Border>
        </Grid>
    </ControlTemplate>

    <ControlTemplate x:Key="GroupBoxBaseLeftTemplate" TargetType="GroupBox">
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto" />
                <ColumnDefinition />
            </Grid.ColumnDefinitions>
            <Border MinWidth="{Binding Path=(hc:TitleElement.MinWidth), RelativeSource={RelativeSource TemplatedParent}}" BorderThickness="{TemplateBinding BorderThickness}" ClipToBounds="False" BorderBrush="{TemplateBinding BorderBrush}" Background="{Binding Path=(hc:TitleElement.Background),RelativeSource={RelativeSource TemplatedParent}}" CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" Margin="0,0,6,0">
                <ContentPresenter TextElement.Foreground="{TemplateBinding Foreground}" Margin="{Binding Path=(hc:TitleElement.Padding), RelativeSource={RelativeSource TemplatedParent}}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" ContentSource="Header" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" RenderTransformOrigin="0.5,0.5">
                    <ContentPresenter.LayoutTransform>
                        <TransformGroup>
                            <RotateTransform Angle="-90" />
                        </TransformGroup>
                    </ContentPresenter.LayoutTransform>
                </ContentPresenter>
            </Border>
            <Border Grid.Column="1" CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}">
                <ContentPresenter Margin="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
            </Border>
        </Grid>
    </ControlTemplate>

    <Style x:Key="GroupBoxBaseStyle" TargetType="GroupBox">
        <Setter Property="BorderBrush" Value="{DynamicResource BorderBrush}" />
        <Setter Property="Background" Value="{DynamicResource SecondaryRegionBrush}" />
        <Setter Property="Foreground" Value="{DynamicResource PrimaryTextBrush}" />
        <Setter Property="hc:TitleElement.Background" Value="{DynamicResource SecondaryRegionBrush}" />
        <Setter Property="hc:TitleElement.TitlePlacement" Value="Top" />
        <Setter Property="hc:TitleElement.Padding" Value="4 0" />
        <Setter Property="hc:TitleElement.MinHeight" Value="{StaticResource DefaultControlHeight}" />
        <Setter Property="hc:TitleElement.MinWidth" Value="{StaticResource DefaultControlHeight}" />
        <Setter Property="hc:BorderElement.CornerRadius" Value="{StaticResource DefaultCornerRadius}" />
        <Setter Property="VerticalContentAlignment" Value="Center" />
        <Setter Property="HorizontalContentAlignment" Value="Center" />
        <Setter Property="BorderThickness" Value="1" />
        <Setter Property="Padding" Value="4" />
        <Setter Property="Template" Value="{StaticResource GroupBoxBaseTopTemplate}" />
        <Style.Triggers>
            <Trigger Property="hc:TitleElement.TitlePlacement" Value="Left">
                <Setter Property="Template" Value="{StaticResource GroupBoxBaseLeftTemplate}" />
                <Setter Property="hc:TitleElement.Padding" Value="0 4" />
            </Trigger>
        </Style.Triggers>
    </Style>

    <ControlTemplate x:Key="GroupBoxOriginalTopTemplate" TargetType="GroupBox">
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto" />
                <RowDefinition />
            </Grid.RowDefinitions>
            <StackPanel Orientation="Horizontal" Margin="8,6">
                <ContentPresenter TextElement.Foreground="{TemplateBinding Foreground}" Margin="1,0,0,0" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" ContentSource="Header" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                <ContentPresenter TextElement.Foreground="{DynamicResource DangerBrush}" Margin="4,0,0,0" Content="{Binding Path=(hc:InfoElement.Symbol),RelativeSource={RelativeSource TemplatedParent}}" Visibility="{Binding Path=(hc:InfoElement.Necessary),RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource Boolean2VisibilityConverter}}" />
            </StackPanel>
            <Border Grid.Row="1" CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}">
                <ContentPresenter Margin="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
            </Border>
        </Grid>
    </ControlTemplate>

    <ControlTemplate x:Key="GroupBoxOriginalLeftTemplate" TargetType="GroupBox">
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="{Binding Path=(hc:InfoElement.TitleWidth),RelativeSource={RelativeSource TemplatedParent}}" />
                <ColumnDefinition />
            </Grid.ColumnDefinitions>
            <StackPanel Orientation="Horizontal" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Margin="0,8,6,8">
                <ContentPresenter TextElement.Foreground="{TemplateBinding Foreground}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" ContentSource="Header" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                <ContentPresenter TextElement.Foreground="{DynamicResource DangerBrush}" Margin="4,0,0,0" Content="{Binding Path=(hc:InfoElement.Symbol),RelativeSource={RelativeSource TemplatedParent}}" Visibility="{Binding Path=(hc:InfoElement.Necessary),RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource Boolean2VisibilityConverter}}" />
            </StackPanel>
            <Border Grid.Column="1" CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}">
                <ContentPresenter Margin="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
            </Border>
        </Grid>
    </ControlTemplate>

    <Style x:Key="GroupBoxOriginalBaseStyle" BasedOn="{StaticResource GroupBoxBaseStyle}" TargetType="GroupBox">
        <Setter Property="hc:BorderElement.CornerRadius" Value="0" />
        <Setter Property="VerticalContentAlignment" Value="Top" />
        <Setter Property="Background" Value="Transparent" />
        <Setter Property="BorderThickness" Value="0" />
        <Setter Property="Padding" Value="0" />
        <Setter Property="Template" Value="{StaticResource GroupBoxOriginalTopTemplate}" />
        <Style.Triggers>
            <Trigger Property="hc:TitleElement.TitlePlacement" Value="Left">
                <Setter Property="Template" Value="{StaticResource GroupBoxOriginalLeftTemplate}" />
            </Trigger>
        </Style.Triggers>
    </Style>

    <ControlTemplate x:Key="GroupBoxTabTopTemplate" TargetType="GroupBox">
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto" />
                <RowDefinition />
            </Grid.RowDefinitions>
            <Border Grid.Row="1" CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource CornerRadiusSplitConverter},ConverterParameter='0,0,1,1'}" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}">
                <ContentPresenter Margin="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
            </Border>
            <Border Grid.Row="0" MinHeight="{Binding Path=(hc:TitleElement.MinHeight), RelativeSource={RelativeSource TemplatedParent}}" BorderThickness="{Binding BorderThickness,RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource ThicknessSplitConverter},ConverterParameter='1,1,1,0'}" BorderBrush="{TemplateBinding BorderBrush}" Background="{Binding Path=(hc:TitleElement.Background),RelativeSource={RelativeSource TemplatedParent}}" CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource CornerRadiusSplitConverter},ConverterParameter='1,1,0,0'}">
                <ContentPresenter TextElement.Foreground="{TemplateBinding Foreground}" Margin="{Binding Path=(hc:TitleElement.Padding), RelativeSource={RelativeSource TemplatedParent}}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" ContentSource="Header" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
            </Border>
        </Grid>
    </ControlTemplate>

    <ControlTemplate x:Key="GroupBoxTabLeftTemplate" TargetType="GroupBox">
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto" />
                <ColumnDefinition />
            </Grid.ColumnDefinitions>
            <Border Grid.Column="1" CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource CornerRadiusSplitConverter},ConverterParameter='0,1,1,0'}" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}">
                <ContentPresenter Margin="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
            </Border>
            <Border Grid.Column="0" MinWidth="{Binding Path=(hc:TitleElement.MinWidth), RelativeSource={RelativeSource TemplatedParent}}" BorderThickness="{Binding BorderThickness,RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource ThicknessSplitConverter},ConverterParameter='1,1,0,1'}" BorderBrush="{TemplateBinding BorderBrush}" Background="{Binding Path=(hc:TitleElement.Background),RelativeSource={RelativeSource TemplatedParent}}" CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource CornerRadiusSplitConverter},ConverterParameter='1,0,0,1'}">
                <ContentPresenter TextElement.Foreground="{TemplateBinding Foreground}" Margin="{Binding Path=(hc:TitleElement.Padding), RelativeSource={RelativeSource TemplatedParent}}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" ContentSource="Header" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}">
                    <ContentPresenter.LayoutTransform>
                        <TransformGroup>
                            <RotateTransform Angle="-90" />
                        </TransformGroup>
                    </ContentPresenter.LayoutTransform>
                </ContentPresenter>
            </Border>
        </Grid>
    </ControlTemplate>

    <Style x:Key="GroupBoxTabBaseStyle" BasedOn="{StaticResource GroupBoxBaseStyle}" TargetType="GroupBox">
        <Setter Property="Template" Value="{StaticResource GroupBoxTabTopTemplate}" />
        <Style.Triggers>
            <Trigger Property="hc:TitleElement.TitlePlacement" Value="Left">
                <Setter Property="Template" Value="{StaticResource GroupBoxTabLeftTemplate}" />
                <Setter Property="hc:TitleElement.Padding" Value="0 4" />
            </Trigger>
        </Style.Triggers>
    </Style>

</ResourceDictionary>