最近精简代码，有些bug，修复

AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/TextDesignerItemViewModel.cs

@@ -39,13 +39,14 @@ namespace AIStudio.Wpf.DiagramDesigner
         {
             base.Init(root, initNew);
 
-            CustomText = true;         
+            CustomText = true;   
         }
 
         protected override void InitNew()
         {
             this.ItemWidth = 150;
             this.ClearConnectors();
+            ShowText = true;
         }
 
         private string _watermark = "请输入文本";
@@ -60,5 +61,10 @@ namespace AIStudio.Wpf.DiagramDesigner
                 SetProperty(ref _watermark, value);
             }
         }
+
+        protected override void ClearText()
+        {
+            Root.RemoveItemCommand.Execute(this);
+        }
     }
 }