BrightSharp.Toolkit/BrightSharp/Themes/Controls/ZoomControl.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:diag="clr-namespace:BrightSharp.Diagrams">

    <Style TargetType="{x:Type diag:ZoomControl}">
        <Setter Property="Background" Value="Transparent" />
        <Setter Property="ClipToBounds" Value="True" />
        <Setter Property="Focusable" Value="False" />
        <Setter Property="ItemsPanel">
            <Setter.Value>
                <ItemsPanelTemplate>
                    <Canvas Background="Transparent" />
                </ItemsPanelTemplate>
            </Setter.Value>
        </Setter>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type diag:ZoomControl}">
                    <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Margin="{TemplateBinding Padding}">
                        <Grid>
                            <ItemsPresenter>
                                <ItemsPresenter.RenderTransform>
                                    <TransformGroup>
                                        <ScaleTransform ScaleX="{Binding RenderZoom, RelativeSource={RelativeSource TemplatedParent}}" 
                                                        ScaleY="{Binding ScaleX, RelativeSource={RelativeSource Self}}" />
                                        <TranslateTransform X="{Binding TranslateX, RelativeSource={RelativeSource TemplatedParent}}" 
                                                            Y="{Binding TranslateY, RelativeSource={RelativeSource TemplatedParent}}" />
                                    </TransformGroup>
                                </ItemsPresenter.RenderTransform>
                            </ItemsPresenter>
                            <Border x:Name="PART_SelectionBorder" />
                        </Grid>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>