debugging app refreshes

docs/examples/introduction/intro02.py

@@ -3,6 +3,10 @@ from textual.app import App
 
 class ExampleApp(App):
 
+    CSS = """
+
+    """
+
     COLORS = [
         "white",
         "maroon",
@@ -18,12 +22,15 @@ class ExampleApp(App):
 
     def on_mount(self):
         self.styles.background = "darkblue"
+        self.bind("t", "tree")
 
     def on_key(self, event):
         if event.key.isdigit():
             self.styles.background = self.COLORS[int(event.key)]
         self.bell()
 
+    def action_tree(self):
+        self.log(self.tree)
 
 app = ExampleApp()
 app.run()