添加项目文件。

Dragablz/DragablzDemo/TabablzControlProxy.cs

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+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+using System.Windows.Controls;
+using System.Windows.Input;
+using Dragablz;
+using Dragablz.Dockablz;
+
+namespace DragablzDemo
+{
+    public class TabablzControlProxy : INotifyPropertyChanged
+    {
+        private readonly TabablzControl _tabablzControl;
+        private readonly ICommand _splitHorizontallyCommand;
+        private readonly ICommand _splitVerticallyCommand;
+        private double _splitRatio;
+
+        public TabablzControlProxy(TabablzControl tabablzControl)
+        {
+            _tabablzControl = tabablzControl;
+
+            _splitHorizontallyCommand = new AnotherCommandImplementation(_ => Branch(Orientation.Horizontal));
+            _splitVerticallyCommand = new AnotherCommandImplementation(_ => Branch(Orientation.Vertical));
+            SplitRatio = 5;
+        }
+
+        public ICommand SplitHorizontallyCommand
+        {
+            get { return _splitHorizontallyCommand; }
+        }
+
+        public ICommand SplitVerticallyCommand
+        {
+            get { return _splitVerticallyCommand; }
+        }
+
+        public double SplitRatio
+        {
+            get { return _splitRatio; }
+            set
+            {
+                _splitRatio = value;
+                OnPropertyChanged("SplitRatio");
+            }
+        }
+
+        private void Branch(Orientation orientation)
+        {
+            var branchResult = Layout.Branch(_tabablzControl, orientation, false, SplitRatio/10);
+
+            var newItem = new HeaderedItemViewModel
+            {
+                Header = "Code-Wise",
+                Content = "This item was added in via code, using Layout.Branch, and TabablzControl.AddToSource"
+            };
+
+            branchResult.TabablzControl.AddToSource(newItem);
+            branchResult.TabablzControl.SelectedItem = newItem;
+        }
+
+        public event PropertyChangedEventHandler PropertyChanged;
+        
+        protected virtual void OnPropertyChanged(string propertyName)
+        {
+            var handler = PropertyChanged;
+            if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
+        }
+    }
+}