Fix

text.py

@@ -1,21 +1,16 @@
-from textual.app import App
-from textual.widgets import ScrollView, TabView, Tab
+from textual.app import App, ComposeResult
+from textual.widgets import TabbedContent, TabPane, TextArea
 
 class SimpleCLITool(App):
-    async def on_mount(self):
-        # Create TabView with two tabs
-        tabs = TabView(
-            tabs=[
-                Tab("First Tab", content=ScrollView(auto_width=True)),
-                Tab("Second Tab", content=ScrollView(auto_width=True))
-            ]
-        )
+    def compose(self) -> ComposeResult:
+        # Create TabbedContent with two tabs
+        yield TabbedContent() as tc:
+            # First Tab
+            with TabPane("First Tab"):
+                yield TextArea("This is the content of the first tab. " * 10, auto_width=True)
 
-        # Update content for each tab
-        tabs.tabs[0].content.update("This is the content of the first tab. " * 10)
-        tabs.tabs[1].content.update("This is the content of the second tab. " * 10)
-
-        # Dock the tabs into the app's view
-        await self.view.dock(tabs)
+            # Second Tab
+            with TabPane("Second Tab"):
+                yield TextArea("This is the content of the second tab. " * 10, auto_width=True)
 
 SimpleCLITool.run(log="textual.log")