添加项目文件。

AIStudio.Wpf.ADiagram/Demos/Logical/ViewModels/ValueDesignerItemData.cs

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+using AIStudio.Wpf.ADiagram.Models;
+using Util.DiagramDesigner;
+
+namespace AIStudio.Wpf.ADiagram.Demos.Logical
+{
+    /// <summary>
+    /// This is passed to the PopupWindow.xaml window, where a DataTemplate is used to provide the
+    /// ContentControl with the look for this data. This class is also used to allow
+    /// the popup to be cancelled without applying any changes to the calling ViewModel
+    /// whos data will be updated if the PopupWindow.xaml window is closed successfully
+    /// </summary>
+    public class ValueDesignerItemData : TitleBindableBase
+    {
+        public ValueDesignerItemData(double value)
+        {
+            this.Value = value;           
+        }
+
+        private double _value;
+        public double Value
+        {
+            get
+            {
+                return _value;
+            }
+            set
+            {
+                SetProperty(ref _value, value);
+            }
+        }
+    }
+}