Kepler-Release/Venus/Venus_Themes/UserControls/PathButton.xaml

<Button x:Class="Venus_Themes.UserControls.PathButton"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:Venus_Themes.UserControls"
             mc:Ignorable="d" 
             Style="{DynamicResource PathButtonStyle}"
             d:DesignHeight="450" d:DesignWidth="800">
    <Button.Resources>
        <Style x:Key="FocusVisual">
            <Setter Property="Control.Template">
                <Setter.Value>
                    <ControlTemplate>
                        <Rectangle Margin="2"
                                   SnapsToDevicePixels="true"
                                   Stroke="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"
                                   StrokeDashArray="1 2"
                                   StrokeThickness="1" />
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
        <Style x:Key="PathButtonStyle"
               TargetType="{x:Type Button}">
            <Setter Property="FocusVisualStyle" Value="{StaticResource FocusVisual}" />
            <Setter Property="Background" Value="#00000000" />
            <Setter Property="BorderBrush" Value="#00000000" />
            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}" />
            <Setter Property="BorderThickness" Value="0,1,1,1" />
            <Setter Property="HorizontalContentAlignment" Value="Center" />
            <Setter Property="VerticalContentAlignment" Value="Center" />
            <Setter Property="Padding" Value="1" />
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Button}">
                        <Border x:Name="border"
                                Background="{TemplateBinding Background}"
                                BorderBrush="{TemplateBinding BorderBrush}"
                                BorderThickness="{TemplateBinding BorderThickness}"
                                SnapsToDevicePixels="true">
                            <Path x:Name="Path"
                                  Data="{Binding PathData}"
                                  Fill="{Binding DefaultFillBrush}"
                                  RenderTransformOrigin="0.5,0.5"
                                  Stretch="Uniform" />
                        </Border>

                        <ControlTemplate.Triggers>
                            <Trigger Property="IsDefaulted" Value="True">
                                <Setter TargetName="Path" Property="Fill" Value="{Binding DefaultFillBrush}" />
                            </Trigger>
                            <Trigger Property="IsMouseOver" Value="True">
                                <Setter TargetName="Path" Property="Fill" Value="{Binding MouseOverBrush}" />
                            </Trigger>
                            <Trigger Property="IsPressed" Value="True">
                                <Setter TargetName="Path" Property="Fill" Value="{Binding IsPressedBrush}" />
                            </Trigger>
                            <Trigger Property="IsEnabled" Value="False">
                                <Setter TargetName="Path" Property="Fill" Value="{Binding IsEnabledBrush}" />
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Button.Resources>
</Button>