AS3: Runtime loading of images

The steps on this link work: http://www.heaveninteractive.com/weblog/2008/03/28/loading-an-external-jpg-png-or-gif-file-in-actionscript-30/

AS3: Embedding XML files

If you have a XML file called myfile.xml. Code to include this would be:

[Embed(source="mfile.xml", mimeType="application/octet-stream")]
[Bindable]
private var my_file:Class;

function some_func():void {
   var my_xml:XML = XML(new my_file);
}

my_xml now contains valid XML. You can now access stuff it like normal XML variables.

Got this from the comments in this post: http://dispatchevent.org/roger/embed-almost-anything-in-your-swf/

AS3: Adding a Sprite as a child to a Flex Container for example a Canvas

From http://www.sebastiaanholtrop.com/archives/3 use:

import mx.core.*;

var my_canvas:Canvas = new Canvas();
var my_uic:UIComponent = new UIComponent();
var my_sprite:Sprite = new Sprite();

my_canvas.addChild(my_uic);
my_uic.addChild(my_sprite);

Flex 3: Adding you custom component sources in the compiler

Rather then copying custom or external code libraries to your source, it is better to add it using mxmlc compiler option "--source-path=/your/path/here".

AS3: Enabling scaling in AS3 for your games or movies

By default AS3 set scaling to NO_SCALE. If you want to override this so that your games or movies scale properly use:

stage.scaleMode = StageScaleMode.SHOW_ALL;

once your stage has been initialized.

AS3: Opening a window in the users browser

Use navigateToURL if you want to open a window in the users browser. For example:

 navigateToURL(new URLRequest("http://www.lazysquirrelgames.com"),  
  "_blank"); 

Adobe documentation:
http://livedocs.adobe.com/flash/9.0/ActionScriptLangRefV3/flash/net/URLRequest.html

AS3: Customizing the preloader

By default Flash player displays a simple bar for loading progress. A little code snippet at http://www.flexdeveloper.eu/forums/actionscript-3-0/download-progress-bar-(downloadprogressbar)/ shows how to start modifying this initial screen. The code does not generate anything pretty but is a good start towards understanding what needs to be done.

The relevant adobe documents:
http://livedocs.adobe.com/flex/3/html/help.html?content=app_container_4.html
http://livedocs.adobe.com/flex/3/langref/mx/preloaders/DownloadProgressBar.html