How to capture events on tkinter child widgets?

Question

In the following block, clicking on a_frame triggers the event handler on_frame_click, but clicking on a_label which is a child of a

Answer 1

Based on what it says in the Levels of Binding section of this online Tkinter reference, it sounds like it's possible because you can bind a handler to three different levels.
To summarize:

1. Instance Level: Bind an event to a specific widget.
2. Class Level: Bind an event to all widgets of a specific class.
3. Application Level: Widget independent -- certain events always invoke a specific handler.

For the details please refer to the first link.

Hope this helps.