SHJX_GM/SHJX.Service.WorkFlowEdit/themes/Node.xaml

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:c="clr-namespace:SHJX.Service.WorkFlowEdit">

    <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="/SHJX.Service.WorkFlowEdit;component/Themes/Shared.xaml" />
    </ResourceDictionary.MergedDictionaries>

    <Style TargetType="{x:Type c:Node}">
        <Setter Property="MinWidth" Value="10" />
        <Setter Property="MinHeight" Value="10" />
        <Setter Property="SnapsToDevicePixels" Value="True" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type c:Node}">
                    <Grid DataContext="{Binding RelativeSource={RelativeSource TemplatedParent}}">
                        <ContentPresenter
                            HorizontalAlignment="Stretch"
                            VerticalAlignment="Stretch"
                            Content="{TemplateBinding Content}" />

                        <ItemsControl ItemsSource="{Binding Ports}">
                            <ItemsControl.ItemsPanel>
                                <ItemsPanelTemplate>
                                    <Grid />
                                </ItemsPanelTemplate>
                            </ItemsControl.ItemsPanel>
                        </ItemsControl>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>