<ResourceDictionary 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

    <!-- Arrow button used in in the nesting material library and queue -->
    <Style x:Key="HeaderArrowButton" TargetType="{x:Type Button}">
        <Setter Property="RenderTransformOrigin" Value="0.5, 0.5" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Button}">
                    <Border Background="Transparent" Margin="2">
                        <ContentPresenter />
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver" Value="true">
                            <Setter Property="Opacity" Value="0.8" />
                            <Setter Property="RenderTransform">
                                <Setter.Value>
                                    <ScaleTransform ScaleX="1.1" ScaleY="1.1" />
                                </Setter.Value>
                            </Setter>
                        </Trigger>
                        <Trigger Property="IsPressed" Value="true">
                            <Setter Property="RenderTransform">
                                <Setter.Value>
                                    <ScaleTransform ScaleX="0.9" ScaleY="0.9" />
                                </Setter.Value>
                            </Setter>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

</ResourceDictionary>