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

<UserControl x:Class="Venus_Themes.UserControls.CustomSwitch"
             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" 
             d:DesignHeight="20" d:DesignWidth="150" x:Name="switch">

    <StackPanel Orientation="Horizontal">
        <Ellipse Width="20" Height="20" Fill="Silver" x:Name="ellipse">
            <Ellipse.Style>
                <Style TargetType="Ellipse">
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding ElementName=toggleButton,Path=IsChecked}" Value="True">
                            <Setter Property="Fill" Value="Green"/>
                        </DataTrigger>
                        <DataTrigger Binding="{Binding ElementName=toggleButton,Path=IsChecked}" Value="False">
                            <Setter Property="Fill" Value="Silver"/>
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </Ellipse.Style>
        </Ellipse>
        <ToggleButton Margin="10,0,0,0"  x:Name="toggleButton" Height="20"  Click="toggleButton_Click" FontWeight="Bold">
            <ToggleButton.Template >
                <ControlTemplate TargetType="{x:Type ToggleButton}" >
                    <Border BorderBrush="{TemplateBinding Control.BorderBrush}" BorderThickness="1,0,1,1" CornerRadius="5">
                        <Border.Background>
                            <LinearGradientBrush  StartPoint="0.5,0" EndPoint="0.5,1">
                                <GradientStop Color="White" Offset="0.0" />
                                <GradientStop Color="Gray" Offset="0.2" />
                                <GradientStop Color="White" Offset="1" />
                            </LinearGradientBrush>
                        </Border.Background>
                        <Border.Cursor>Hand</Border.Cursor>
                        <ContentPresenter Content="{Binding ElementName=switch,Path=Value}"  HorizontalAlignment="Center" VerticalAlignment="Center" ></ContentPresenter>
                    </Border>
                </ControlTemplate>
            </ToggleButton.Template>
        </ToggleButton>
    </StackPanel>
</UserControl>