# Event Propagation deep concepts need clarification **URL:** \ **Category:** flash\ **Created:** [October 28, 2010, 6:12am UTC](https://forum.kirupa.com/t/event-propagation-deep-concepts-need-clarification/315524 "2010-10-28T06:12:41Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![kadaj](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.kirupa.com/kadaj/32/9061_2.png) [@kadaj](https://forum.kirupa.com/u/kadaj)\ **Post date:** [October 28, 2010, 6:12am UTC](https://forum.kirupa.com/t/event-propagation-deep-concepts-need-clarification/315524/1 "2010-10-28T06:12:41Z")
This question is very crucial for my understanding of events. So please take a good look at and help make the concepts thorough. Consider the figure below: ```auto +---+ | 1 | +---+ _____|_____ | | +---+ +---+ | 2 | | 3 | +---+ +---+ _____|_____ | | +---+ +---+ | 4 | | 5 | +---+ +---+ ``` 1 is the main default application. 2, 3, 4 are modules in flex terminology (simply swfs). 1 loads 2, 3. 3 loads 4, 5. 2 doesn’t know about 3, 4, 5. 4 doesn’t know about 5 even if both are loaded by 3. Say modules are independent. i) Module 4 dispatches an event (flash.events.Event). Will module 2 get that event? Will module 2 get it in any cases like setting capture == true ? ii) When module 4 dispatches an event where does that event first begins or originate? Or in other words in which place does that event gets fired? Is it from 1 -\> 3 -\> 4 in capture phase (which is set to false by default)? And from 4 -\> 3-\> 1 in bubbling phase (if bubble is set to true)? Right? iii) Why is capture phase computationally expensive and not commonly used (from [livedocs](http://livedocs.adobe.com/flex/3/html/help.html?content=events_08.html))? iv) When ever an event is dispatched it actually originates from the top most level (stage), true or false ? Thank You 🙂