bug修复

VIZ.Framework.Common/Widgets/NavigationControl/NavigationItemControl.cs

@@ -82,6 +82,11 @@ namespace VIZ.Framework.Common
         internal WeakReference<NavigationControl> OwnerNavigaiton;
 
         /// <summary>
+        /// 是否已经完成了视图创建
+        /// </summary>
+        internal bool IsCreatedView;
+
+        /// <summary>
         /// 销毁内容
         /// </summary>
         public void DisposeContent()
@@ -140,7 +145,7 @@ namespace VIZ.Framework.Common
         private void TryCreateContent()
         {
             // 已经包含内容，则不创建
-            if (this.Content != null && !(this.Content is NavigationConfig))
+            if (this.IsCreatedView)
                 return;
 
             NavigationConfig config = this.DataContext as NavigationConfig;
@@ -152,6 +157,8 @@ namespace VIZ.Framework.Common
             {
                 this.TryCreateContentFromViewType();
             }
+
+            this.IsCreatedView = true;
         }
 
         /// <summary>