<Window x:Class="WpfApplication2.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Button Grid.Row="0"
                Grid.Column="8"
                VerticalAlignment="Center"
                HorizontalAlignment="Center"
                HorizontalContentAlignment="Center"
                VerticalContentAlignment="Center">
            <Path Width="10"
                Height="10"
                Margin="0,0,0,0"
                Fill="Orange"
                Stretch="Uniform"
                RenderTransformOrigin="0.5,0.5"
                Data="M7.1999998,0L16,8.7999997 24.799999,0 32,7.1999998 23.2,16 32,24.799999 24.799999,32 16,23.2 7.1999998,32 0,24.799999 8.7999997,16 0,7.1999998z">
                <Path.RenderTransform>
                    <TransformGroup>
                        <TransformGroup.Children>
                            <RotateTransform Angle="0" />
                            <ScaleTransform ScaleX="1" ScaleY="1" />
                        </TransformGroup.Children>
                    </TransformGroup>
                </Path.RenderTransform>
                <Path.Style>
                    <Style TargetType="{x:Type Path}">
                        <Style.Triggers>
                        <DataTrigger Binding="{Binding IsMouseOver, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Button}}" Value="True" >
                                <Setter Property="Fill" Value="#FF5733" ></Setter>
                            </DataTrigger>
                        <DataTrigger Binding="{Binding IsMouseOver, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Button}}" Value="False" >
                                <Setter Property="Fill" Value="Orange" ></Setter>
                            </DataTrigger>
                        </Style.Triggers>
                    </Style>
                </Path.Style>
            </Path>
        </Button>
    </Grid>
</Window>