If you need to remove list of selected items in List component in Flex
you should not go from first element to last element of selectedIndices array
because once you remove one selected element all indexes will shift on one position to the left
solution is very simple you just need to go from last element to first element of selectedIndices array
in this case you will not have any problems with indexes
same for simple Array
In my project I had situation that I need to load flex transparent flex application and to haveposssibility to click through this applicatio
I was trying to set backgroundAlpha to zero, but it doesn’t help me because application container overlap object under this application
here is a trick
on application create complete:
it will removes displayObject in application which overlaps objects under flex app
Today I got problem with showEffect in my project, when I added my component via PopUpManager.addPopUp I notice that showEffect doesn’t run.
To get it working you need add creationComplete handled inside component and dispatch FlexEvent.SHOW event in created handler.
happy coding 
I am glad to say that Flash & Flex Developer’s Magazine published new issue
FFD’s magazine is great, they growing every day, it seems that there is working professional people, they know how to do work in a best way!
Their articles dealing with important things for flash and flex developers.
Contents includes the following articles and tutorials
I would like to highlight some excellent articles:
Everyone who is interesting to publish article can do it without any problems, this magazine is open for any suggestions
I published my first article “OOP with AS3″ in their first issue on 1/2008 and was very happy
You can find my second article in 2/2009 issue:
You can subscribe to FFD’s magazine here
Can’t wait for next issue, nice work guys!
This presentation will guide you through the MVC Pattern and Flex implementation of MVC (Cairgorm and Mate Frameworks)
download MVC.pptx (724.83 KB)Don’t forget
By default Flex Builder compile application to debug build,
Don’t forget before deploying your application to production server to export release build
Project -> Export Release Build…
release build can be twice smaller than debug version
EXTERNALIZING ASSETS
There are a number of ways to externalize code and assets.
MODULES
If there is application functionality that not every client will use or may not be used right away, you can split it into a module; a module is compiled into its own SWF and then is loaded at runtime via code. The root tag in an MXML file defining a module is mx:Module. Modules are loaded at runtime using the ModuleLoader.
RSLS
If you have multiple applications that share some of the same code libraries, you can use runtime-shared libraries to only require the code be downloaded once and used by both applications during the browser session. Note, only Adobe signed runtime-shared libraries can persist on the client and be cached by the Flash Player after the browser is closed. This is a new feature available in Flash Player 9 Update 3 (9,0,115,0) that enables the Flex framework to be cached and used by Flex applications from any domain.
More info on RSLs at livedocs
RUNTIME CSS LOADING
You can load style sheets at run time by using the StyleManager. These style sheets take the form of SWF files that are dynamically loaded while your Flex application runs.
By loading style sheets at run time, you can load images (for graphical skins), fonts, type and class selectors, and programmatic skins into your Flex application without embedding them at compile time. This lets skins and fonts be partitioned into separate SWF files, away from the main application. As a result, the application’s SWF file size is smaller.
RUNTIME LOADING OF ASSETS
The Image control in Flex takes a source which can either be an embedded image or a relative path to the image. When the latter is specified, the image is loaded at runtime and is not embedded into the SWF file.
Embedded image:<mx:Image source=”@Embed(source=’./assets/butterfly.gif’)”/>Image loaded at runtime:
<mx:Image source=”/assets/butterfly.gif”/>
SUB-APPLICATIONS (Flex 3.2)
As of Flex 3.2 (and higher), there is now an additional option: sub-applications.
The PDF of the chapter in the doc is here:
Chapter 1: Developing and loading subapplications
http://livedocs.adobe.com/flex/3/loading_applications.pdf
The original planning overview (then code named “Marshall Plan”) can be found here:
http://opensource.adobe.com/wiki/display/flexsdk/Marshall Plan
Additional info:
http://www.adobe.com/cfusion/communityengine/index.cfm?event=showdetails&productId=2&postId=12169
http://www.countermarch.com/blog/index.cfm/2008/2/26/Optimizing-with-Flex-3
http://www.simplyprofound.com/post/Flex-3-Optimization-and-SWF-Filesize.aspx
http://www.slideshare.net/dcoletta/optimizing-flex-applications
http://livedocs.adobe.com/flex/3/html/help.html?content=performance_06.html
One time when I started to develop project based on Cairngorm Framework, I had a task to create a lot of Value Objects (VO)
When you embed fonts, Flex stores all of the font information in the SWF file so the font is displayed properly even if it’s not installed on the user’s computer. If you use a font in your sources that isn’t installed on a user’s system, and you don’t embed the font in the SWF file, Flash Player automatically selects a substitute font to use instead. Sometimes you have to embed font event if you are sure that it is installed on a user’s system, because to mask, tween and skew dynamic text fields possible only with embedded fonts.
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To make Internationalization/Localization for your Flex applications very easy
Lets split whole process by steps
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Runtime Shared Libraries (RSLs) are libraries of components that are shared by applications in the same domain.
You can shrink the size of your application’s resulting SWF file by externalizing shared assets into standalone files that you can separately download and cache on the client. Multiple Flex applications can load these shared assets at runtime, but each client need only to download them once. These shared files are called Runtime Shared Libraries.
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