Fix

text.py

@@ -1,32 +1,14 @@
-from textual.app import App
-from textual.widgets import TabbedContent, TabPane, TextArea
+from textual.app import App, ComposeResult
+from textual.widgets import Markdown, TabbedContent, TabPane
 
-class SimpleCLITool(App):
+class TabbedApp(App):
+    def compose(self) -> ComposeResult:
+        with TabbedContent(initial="tab1"):
+            with TabPane("First Tab", id="tab1"):
+                yield Markdown("This is the content of the first tab.")
+            with TabPane("Second Tab", id="tab2"):
+                yield Markdown("This is the content of the second tab.")
 
-    async def on_mount(self):
-        # Create TabbedContent with two tabs
-        tabbed_content = TabbedContent()
-
-        # First Tab with its content
-        first_tab = TabPane("First Tab")
-        first_tab_content = TextArea()
-        first_tab_content.value = "This is the content of the first tab. " * 10
-        await first_tab.mount(first_tab_content)
-
-        # Second Tab with its content
-        second_tab = TabPane("Second Tab")
-        second_tab_content = TextArea()
-        second_tab_content.value = "This is the content of the second tab. " * 10
-        await second_tab.mount(second_tab_content)
-
-        # Add tabs to TabbedContent
-        tabbed_content.add_tab(first_tab, "First Tab")
-        tabbed_content.add_tab(second_tab, "Second Tab")
-
-        # Dock the TabbedContent into the app's view
-        await self.view.dock(tabbed_content)
-
-# Create an instance of the app and run it
 if __name__ == "__main__":
-    app = SimpleCLITool()
+    app = TabbedApp()
     app.run()