BeWoPlaner/BeWo/Styles/DataTemplates/ControlTemplates.xaml

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:Microsoft_Windows_Themes="clr-namespace:Microsoft.Windows.Themes;assembly=PresentationFramework.Aero">
    <ResourceDictionary.MergedDictionaries>

        <ResourceDictionary Source="..\Colors\Colors.xaml" />

    </ResourceDictionary.MergedDictionaries>
    <Style x:Key="ComboBoxFocusVisual">
        <Setter Property="Control.Template">
            <Setter.Value>
                <ControlTemplate>
                    <Rectangle
                        Margin="4,4,21,4"
                        SnapsToDevicePixels="true"
                        Stroke="Black"
                        StrokeDashArray="1 2"
                        StrokeThickness="1" />
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <!--  Control Templates  -->
    <ControlTemplate x:Key="ComboBoxEditableTemplate" TargetType="{x:Type ComboBox}">
        <Grid SnapsToDevicePixels="true">
            <Border
                x:Name="Bd"
                Padding="1"
                Background="{TemplateBinding Background}"
                BorderBrush="{TemplateBinding BorderBrush}"
                BorderThickness="{TemplateBinding BorderThickness}">
                <Grid Grid.IsSharedSizeScope="true">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="1" />
                        <ColumnDefinition Width="*" />
                        <ColumnDefinition Width="Auto" SharedSizeGroup="ComboBoxButton" />
                    </Grid.ColumnDefinitions>
                    <TextBox
                        x:Name="PART_EditableTextBox"
                        Grid.Column="1"
                        Margin="{TemplateBinding Padding}"
                        HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
                        VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
                        IsReadOnly="{Binding Path=IsReadOnly, RelativeSource={RelativeSource TemplatedParent}}"
                        Style="{DynamicResource ComboBoxEditableTextBox}" />
                    <ToggleButton
                        Grid.Column="0"
                        Grid.ColumnSpan="3"
                        Background="{x:Null}"
                        IsChecked="{Binding Path=IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
                        Style="{DynamicResource ComboBoxTransparentButtonStyle}" />
                </Grid>
            </Border>
            <Popup
                x:Name="PART_Popup"
                AllowsTransparency="true"
                Focusable="false"
                IsOpen="{Binding Path=IsDropDownOpen, RelativeSource={RelativeSource TemplatedParent}}"
                Placement="Bottom"
                PopupAnimation="{DynamicResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}">
                <Microsoft_Windows_Themes:SystemDropShadowChrome
                    x:Name="Shdw"
                    MinWidth="{TemplateBinding ActualWidth}"
                    MaxHeight="{TemplateBinding MaxDropDownHeight}"
                    Color="Transparent">
                    <Border
                        x:Name="DropDownBorder"
                        Background="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"
                        BorderBrush="{DynamicResource {x:Static SystemColors.WindowFrameBrushKey}}"
                        BorderThickness="1">
                        <ScrollViewer>
                            <ItemsPresenter KeyboardNavigation.DirectionalNavigation="Contained" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                        </ScrollViewer>
                    </Border>
                </Microsoft_Windows_Themes:SystemDropShadowChrome>
            </Popup>
        </Grid>
        <ControlTemplate.Triggers>
            <Trigger Property="HasItems" Value="false">
                <Setter TargetName="DropDownBorder" Property="MinHeight" Value="95" />
            </Trigger>
            <Trigger Property="IsEnabled" Value="false">
                <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}" />
                <Setter TargetName="Bd" Property="Background" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}" />
            </Trigger>
            <Trigger Property="IsGrouping" Value="true">
                <Setter Property="ScrollViewer.CanContentScroll" Value="false" />
            </Trigger>
            <Trigger SourceName="PART_Popup" Property="HasDropShadow" Value="true">
                <Setter TargetName="Shdw" Property="Margin" Value="0,0,5,5" />
                <Setter TargetName="Shdw" Property="Color" Value="#71000000" />
            </Trigger>
        </ControlTemplate.Triggers>
    </ControlTemplate>

    <ControlTemplate x:Key="NavigationGroupTemplate2" TargetType="{x:Type GroupBox}">
        <Grid SnapsToDevicePixels="True">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*" />
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto" />
                <RowDefinition Height="*" />
                <RowDefinition Height="Auto" />
            </Grid.RowDefinitions>
            <Border
                Grid.Row="0"
                Grid.Column="0"
                Background="{DynamicResource NavigationHeaderBrush}"
                CornerRadius="1,1,1,1">
                <Border
                    x:Name="Header"
                    Grid.Row="0"
                    Grid.Column="0"
                    Margin="8"
                    Padding="0"
                    Background="{x:Null}">
                    <ContentPresenter
                        Margin="0,0,0,0"
                        Content="{TemplateBinding Header}"
                        ContentSource="Header"
                        ContentStringFormat="{TemplateBinding HeaderStringFormat}"
                        ContentTemplate="{TemplateBinding HeaderTemplate}"
                        RecognizesAccessKey="True"
                        RenderTransformOrigin="0,0.5"
                        SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                </Border>
            </Border>


            <Border
                Grid.Row="1"
                Grid.Column="0"
                Margin="0,2,0,0"
                Padding="0,0,0,0"
                Background="{DynamicResource NavigationContentBrush}"
                CornerRadius="1,1,1,1">
                <ContentPresenter
                    Content="{TemplateBinding Content}"
                    ContentStringFormat="{TemplateBinding ContentStringFormat}"
                    ContentTemplate="{TemplateBinding ContentTemplate}"
                    SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
            </Border>
        </Grid>
    </ControlTemplate>
</ResourceDictionary>