diff --git a/DeedyDesigner/Deedy.Activity/Contract/Interface/IContainerElement.cs b/DeedyDesigner/Deedy.Activity/Contract/Interface/IContainerElement.cs
index b53c7e9..138d86b 100644
--- a/DeedyDesigner/Deedy.Activity/Contract/Interface/IContainerElement.cs
+++ b/DeedyDesigner/Deedy.Activity/Contract/Interface/IContainerElement.cs
@@ -10,6 +10,5 @@ namespace Deedy.Activity
     {
         public void Append(IDeedyElement deedyElement);
         public void Remove(IDeedyElement deedyElement);
-        public void SwapIndex(IDeedyElement element1, IDeedyElement element2);
     }
 }
diff --git a/DeedyDesigner/Deedy.Activity/DeedyAction.cs b/DeedyDesigner/Deedy.Activity/DeedyAction.cs
index 9f0e2dd..66af921 100644
--- a/DeedyDesigner/Deedy.Activity/DeedyAction.cs
+++ b/DeedyDesigner/Deedy.Activity/DeedyAction.cs
@@ -15,11 +15,10 @@ namespace Deedy.Activity
         public string DETitle { get; set; } = "";
         public string DERemark { get; set; } = "";
         public string DEIdentify { get; set; } = "";
-        public IDeedyElement? DeedyParent { get; protected internal set; }
+        public IDeedyElement? ParentElement { get; protected internal set; }
         public IActionViewer? ActionViewer { get; protected internal set; }
-        public DeedyElementCollection Children { get; set; } = new();
 
-        public IDeedyElement DeedyRoot => (this.DeedyParent == null) ? this : this.DeedyParent.DeedyRoot;
+        public IDeedyElement RootElement => (this.ParentElement == null) ? this : this.ParentElement.RootElement;
 
         public event PropertyChangedEventHandler? PropertyChanged;
 
@@ -64,5 +63,15 @@ namespace Deedy.Activity
         {
             throw new NotImplementedException();
         }
+
+        public void SwapIndex(IDeedyElement deedyElement)
+        {
+            throw new NotImplementedException();
+        }
+
+        public void ReadyToWorking(Runtime? runtime)
+        {
+            throw new NotImplementedException();
+        }
     }
 }
diff --git a/DeedyDesigner/Deedy.Activity/DeedyAction/ExecAction.cs b/DeedyDesigner/Deedy.Activity/DeedyAction/ExecAction.cs
index 8c6a168..22897ed 100644
--- a/DeedyDesigner/Deedy.Activity/DeedyAction/ExecAction.cs
+++ b/DeedyDesigner/Deedy.Activity/DeedyAction/ExecAction.cs
@@ -6,7 +6,7 @@ using System.Threading.Tasks;
 
 namespace Deedy.Activity
 {
-    public abstract class ExecAction
+    public abstract class ExecAction : DeedyAction
     {
         protected internal ExecAction() { }
     }
diff --git a/DeedyDesigner/Deedy.Activity/DeedyAction/FlowAction.cs b/DeedyDesigner/Deedy.Activity/DeedyAction/FlowAction.cs
index c2f2637..082a416 100644
--- a/DeedyDesigner/Deedy.Activity/DeedyAction/FlowAction.cs
+++ b/DeedyDesigner/Deedy.Activity/DeedyAction/FlowAction.cs
@@ -6,7 +6,7 @@ using System.Threading.Tasks;
 
 namespace Deedy.Activity
 {
-    public abstract class FlowAction
+    public abstract class FlowAction : DeedyAction
     {
         protected internal FlowAction() { }
     }
diff --git a/DeedyDesigner/Deedy.Activity/DeedyAction/FuncAction.cs b/DeedyDesigner/Deedy.Activity/DeedyAction/FuncAction.cs
index f50e039..de4e48b 100644
--- a/DeedyDesigner/Deedy.Activity/DeedyAction/FuncAction.cs
+++ b/DeedyDesigner/Deedy.Activity/DeedyAction/FuncAction.cs
@@ -6,7 +6,7 @@ using System.Threading.Tasks;
 
 namespace Deedy.Activity
 {
-    public abstract class FuncAction
+    public abstract class FuncAction : DeedyAction
     {
         protected internal FuncAction() { }
     }
diff --git a/DeedyDesigner/Deedy.Activity/DeedyVisual/DeedyLayout.cs b/DeedyDesigner/Deedy.Activity/DeedyVisual/DeedyLayout.cs
index ac81d4a..4fe42a8 100644
--- a/DeedyDesigner/Deedy.Activity/DeedyVisual/DeedyLayout.cs
+++ b/DeedyDesigner/Deedy.Activity/DeedyVisual/DeedyLayout.cs
@@ -14,10 +14,9 @@ namespace Deedy.Activity
         public string DETitle { get; set; } = "";
         public string DERemark { get; set; } = "";
         public string DEIdentify { get; set; } = "";
-        public IDeedyElement? DeedyParent { get; protected internal set; }
-        public DeedyElementCollection Children { get; set; } = new();
+        public IDeedyElement? ParentElement { get; protected internal set; }
 
-        public IDeedyElement DeedyRoot => (this.DeedyParent == null) ? this : this.DeedyParent.DeedyRoot;
+        public IDeedyElement RootElement => (this.ParentElement == null) ? this : this.ParentElement.RootElement;
 
         public DeedyElementCollection Elements { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }
 
@@ -81,5 +80,15 @@ namespace Deedy.Activity
         {
             throw new NotImplementedException();
         }
+
+        public void SwapIndex(IDeedyElement deedyElement)
+        {
+            throw new NotImplementedException();
+        }
+
+        public void ReadyToWorking(Runtime? runtime)
+        {
+            throw new NotImplementedException();
+        }
     }
 }
diff --git a/DeedyDesigner/Deedy.Activity/IDeedyElement.cs b/DeedyDesigner/Deedy.Activity/IDeedyElement.cs
index f4df7ab..3e6941a 100644
--- a/DeedyDesigner/Deedy.Activity/IDeedyElement.cs
+++ b/DeedyDesigner/Deedy.Activity/IDeedyElement.cs
@@ -14,9 +14,11 @@ namespace Deedy.Activity
         public string DETitle { get; set; }
         public string DERemark { get; set; }
         public string DEIdentify { get; set; }
-        public IDeedyElement? DeedyParent { get; }
-        public IDeedyElement DeedyRoot { get; }
+        public IDeedyElement? ParentElement { get; }
+        public IDeedyElement RootElement { get; }
         public void InsertToFore(IDeedyElement deedyElement);
         public void InsertAtRear(IDeedyElement deedyElement);
+        public void SwapIndex(IDeedyElement deedyElement);
+        public void ReadyToWorking(Runtime? runtime);
     }
 }