fix cubetree init crash.

App/wwwroot/HiAPI-docsite/dev-doc/basic/rendering/rendering-canvas/custom-implementation.html

@@ -486,7 +486,7 @@ public RenderingCanvas()
     DisplayerPane.TouchDown += RenderingCanvas_TouchDown;
     DisplayerPane.TouchMove += RenderingCanvas_TouchMove;
     DisplayerPane.TouchUp += RenderingCanvas_TouchUp;
-    
+
     // Enable touch support
     this.IsManipulationEnabled = true;
 
@@ -512,7 +512,7 @@ private unsafe void RenderingCanvas_BufferSwapped(byte* data, int w, int h)
     byte[] arr = new byte[n];
     for (int i = 0; i < n; i++)
         arr[i] = data[i];
-    
+
     // Update UI on the UI thread
     DisplayerPane.Dispatcher.InvokeAsync(() =>
     {
@@ -741,7 +741,7 @@ private unsafe void RenderingCanvas_Loaded(object sender, RoutedEventArgs e)
 {
     // Get the window containing this control
     CurrentWindow = Window.GetWindow(this);
-    
+
     // Set up DispEngine rendering
     DispEngine.ImageRequestAfterBufferSwapped -= RenderingCanvas_BufferSwapped;
     DispEngine.ImageRequestAfterBufferSwapped += RenderingCanvas_BufferSwapped;
@@ -775,7 +775,7 @@ protected virtual void Dispose(bool disposing)
         {
             // Unsubscribe from power events
             SystemEvents.PowerModeChanged -= SystemEvents_PowerModeChanged;
-            
+
             // Dispose the DispEngine to free resources
             DispEngine.Dispose();
         }
@@ -843,7 +843,7 @@ engine.SetViewToHomeView();
 </tr>
 <tr>
 <td>Key press</td>
-<td>&lt;xref:Hi.Disp.DispEngine.KeyDown(System.Int64)&gt; / &lt;xref:Hi.Disp.DispEngine.KeyUp(System.Int64)&gt; and &lt;xref:Hi.Disp.DispEngine.KeyDownTransform(System.Int64,Hi.Native.key_table__transform_view_by_key_pressing_t)&gt;</td>
+<td><a class="xref" href="../../../../api/Hi.Disp.DispEngine.html#Hi_Disp_DispEngine_KeyDown_System_String_">KeyDown(string)</a> / <a class="xref" href="../../../../api/Hi.Disp.DispEngine.html#Hi_Disp_DispEngine_KeyUp_System_String_">KeyUp(string)</a> and <a class="xref" href="../../../../api/Hi.Disp.DispEngine.html#Hi_Disp_DispEngine_KeyDownTransform_System_String_Hi_Native_key_table__transform_view_by_key_pressing_t_">KeyDownTransform(string, key_table__transform_view_by_key_pressing_t)</a></td>
 </tr>
 <tr>
 <td>Touch events</td>