adding synckey

src/content/docs/products/splashkit/SplashKit Tutorials/Documentation/4-adding-oop.mdx

@@ -16,6 +16,7 @@ One of the current goals of the SplashKit team is to enhance the tutorials by in
 The full code block structure for C++, C# in top level and OOP, and Python is as follows:
 
 ````md
+<Tabs syncKey="code-language">
 <Tabs>
 <TabItem label="C++">