Asp.net - onbubbleevent with cached event

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ASP.NET

Scenario:There is an aspx page with TextBox(AutoPostBack = false) and a Button.
When I click the button, events get fired in following order

1. TextBox TextChanged
2. Button Click
3. OnBubbleEvent of Page

Question: What is the use of OnBubbleEvent? I mean in this scenario with cached events, how can we use OnBubbleEvent in real life application?

What I have tried:

I tried to read about Bubbling in ASP.Net, but everywhere it was about controls like Gridview, Repeater etc. I don't understand how this event will be useful in cached event.