aistudio-wpf-diagram/AIStudio.Wpf.DiagramDesigner/UserControls/PointContainer.xaml

<ItemsControl x:Class="AIStudio.Wpf.DiagramDesigner.PointContainer"
             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:AIStudio.Wpf.DiagramDesigner"
             mc:Ignorable="d" 
             d:DesignHeight="450" d:DesignWidth="800">
    <ItemsControl.ItemsPanel>
        <ItemsPanelTemplate>
            <Canvas x:Name="rootCanvas"/>
        </ItemsPanelTemplate>
    </ItemsControl.ItemsPanel>
</ItemsControl>