Fixed an issue where the background color of checkboxes turned white after setting an image for a TreeView node.

Author: Simon Zhao (BEYONDSOFT CONSULTING INC)

src/System.Windows.Forms/System/Windows/Forms/Controls/TreeView/TreeView.cs

@@ -1870,6 +1870,17 @@ protected override void OnHandleCreated(EventArgs e)
             int style = (int)PInvokeCore.GetWindowLong(this, WINDOW_LONG_PTR_INDEX.GWL_STYLE);
             style |= (int)PInvoke.TVS_CHECKBOXES;
             PInvokeCore.SetWindowLong(this, WINDOW_LONG_PTR_INDEX.GWL_STYLE, style);
+
+            if (Application.IsDarkModeEnabled
+                && DarkModeRequestState is true
+                && RecreatingHandle)
+            {
+                _ = PInvoke.SetWindowTheme(
+                    hwnd: HWND,
+                    pszSubAppName: $"{DarkModeIdentifier}_{ExplorerThemeIdentifier}",
+                    pszSubIdList: null);
+            }
+
             UpdateCheckBoxImages();
         }