diff --git a/Demos/AIStudio.Wpf.DiagramDesigner.Demo/ViewModels/Nodes/CustomDefinedDesignerItemViewModel.cs b/Demos/AIStudio.Wpf.DiagramDesigner.Demo/ViewModels/Nodes/CustomDefinedDesignerItemViewModel.cs
index d3e2ff2..57a254b 100644
--- a/Demos/AIStudio.Wpf.DiagramDesigner.Demo/ViewModels/Nodes/CustomDefinedDesignerItemViewModel.cs
+++ b/Demos/AIStudio.Wpf.DiagramDesigner.Demo/ViewModels/Nodes/CustomDefinedDesignerItemViewModel.cs
@@ -32,7 +32,7 @@ namespace AIStudio.Wpf.DiagramDesigner.Demo.ViewModels
             return new DesignerItemBase(this, Answer);
         }
 
-        protected override void Init(IDiagramViewModel root, bool initNew)
+        public override void Init(IDiagramViewModel root, bool initNew)
         {
             base.Init(root, initNew);
         }