mounting

docs/examples/app/widgets02.py

@@ -0,0 +1,15 @@
+from textual.app import App
+from textual.widgets import Welcome
+
+
+class WelcomeApp(App):
+    def on_key(self) -> None:
+        self.mount(Welcome())
+
+    def on_button_pressed(self) -> None:
+        self.exit()
+
+
+app = WelcomeApp()
+if __name__ == "__main__":
+    app.run()