I&#39;ve recently started learning ExtJS, and have trouble understanding how to handle Events. I have no experience of any previous versions of ExtJS. 

From reading various manuals, guides and documentation pages, I&#39;ve figured out how to use it, but I&#39;m not clear on how it works. I&#39;ve found several tutorials for older versions of ExtJS, but I&#39;m not sure how applicable they are in ExtJS 4.

I&#39;m specifically looking on the &quot;final word&quot; on things like

* what arguments does an event handling function get passed? Is there a standard set of args that always get passed?
* how to define custom events for custom components we write? how can we fire these custom event?
* does the return value (true/false) affect how the event bubbles? If not, how can we control event bubbling from within, or outside of the event handler?
* is there a standard way to register event listeners? (I&#39;ve come across two different ways til now, and I&#39;m not sure why each method was used).

For example, [this question][1] leads me to believe that an event handler can receive quite a few arguments. I&#39;ve seen other tutorials where there are just two arguments to the handler. What changes?



  [1]: https://stackoverflow.com/questions/6094411/handling-itemclick-event-on-tree-panel-extjs-4

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Explain ExtJS 4 event handling