diff --git a/AIStudio.Wpf.DiagramDesigner/AttachedProperties/DragAndDropProps.cs b/AIStudio.Wpf.DiagramDesigner/AttachedProperties/DragAndDropProps.cs
index b266ca7..526f05d 100644
--- a/AIStudio.Wpf.DiagramDesigner/AttachedProperties/DragAndDropProps.cs
+++ b/AIStudio.Wpf.DiagramDesigner/AttachedProperties/DragAndDropProps.cs
@@ -86,7 +86,14 @@ namespace AIStudio.Wpf.DiagramDesigner
                 dataObject.Icon = toolBoxData.Icon;
                 dataObject.Text = toolBoxData.Text;
                 dataObject.ColorViewModel = toolBoxData.ColorViewModel;
-                dataObject.DesignerItem = toolBoxData.Addition;
+                //if (toolBoxData.Addition is DesignerItemViewModelBase designerItemViewModelBase)
+                //{
+                //    dataObject.DesignerItem = designerItemViewModelBase.ToSerializableItem();
+                //}
+                //else
+                {
+                    dataObject.DesignerItem = toolBoxData.Addition;
+                }
 
                 DragDrop.DoDragDrop((DependencyObject)sender, dataObject, DragDropEffects.Copy);
                 e.Handled = true;
diff --git a/Directory.Build.Props b/Directory.Build.Props
index 44deea0..8167a32 100644
--- a/Directory.Build.Props
+++ b/Directory.Build.Props
@@ -1,8 +1,8 @@
 <Project>
   <!-- Project properties -->
-  <PropertyGroup>
-    <TargetFrameworks>net6.0-windows</TargetFrameworks>
-  </PropertyGroup>
+	<PropertyGroup>
+    <TargetFrameworks>net461;net5.0-windows;net6.0-windows</TargetFrameworks>
+	</PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
     <NoWarn>1701;1702;CS1591;SA1652;WPF0041</NoWarn>