FestoDebugger/UserControls/FestoControl.xaml

<UserControl x:Class="FestoDebugger.UserControls.FestoControl"
             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:FestoDebugger.UserControls"
             mc:Ignorable="d" x:Name="self"
             d:DesignHeight="180" d:DesignWidth="50">
    <Border BorderBrush="Gray" BorderThickness="1">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="30"/>
            <RowDefinition Height="50"/>
            <RowDefinition Height="50"/>
            <RowDefinition Height="30"/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>

            <ColumnDefinition Width="50"/>

            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
            <Label  Grid.Row="0" Grid.Column="0"   HorizontalAlignment="Center" Content="{Binding ModuleName}" FontSize="10" VerticalContentAlignment="Center" VerticalAlignment="Center" />
        
        <Button  Grid.Row="1" Grid.Column="0" Width="40" Height="30" Background="DeepSkyBlue" Content="On" Click="On_Click" Canvas.Left="60" Canvas.Top="39"></Button>
        <Button  Grid.Row="2" Grid.Column="0" Width="40" Height="30" Background="DeepSkyBlue" Content="Off"  Click="Off_Click" Canvas.Left="101" Canvas.Top="40"></Button>
            <Ellipse Grid.Row="3" Grid.Column="0" Width="16" Height="16" Stroke="Silver" HorizontalAlignment="Center" VerticalAlignment="Top">
                <Ellipse.Style>
                    <Style TargetType="Ellipse">
                        <!-- 默认颜色（SignalOn为false时） -->
                        <Setter Property="Fill" Value="LightGray"/>
                        <Style.Triggers>
                            <!-- 当SignalOn为true时变为绿色 -->
                            <DataTrigger Binding="{Binding SignalOn}" Value="True">
                                <Setter Property="Fill" Value="LimeGreen"/>
                            </DataTrigger>
                            <DataTrigger Binding="{Binding SignalOn}" Value="False">
                                <Setter Property="Fill" Value="LightGray"/>
                            </DataTrigger>
                        </Style.Triggers>
                    </Style>
                </Ellipse.Style>
            </Ellipse>
        </Grid>
    </Border>
</UserControl>