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ActionScript is an issue for my XML students

While earlier versions of ActionScript may have been simple and easy to learn, ActionScript 3 is a fully object-oriented programming language with acomplexity level on par with C++.

Students in my XML class aren't required to have any programming knowledge, and aren't expected to have the prerequisite knowledge that would qualify them tolearn ActionScript 3 while learning XML at the same time. Therefore, the early lessons in this series concentrate on the use of mxml forlayout and control and forego any requirement to understand ActionScript 3. As I mentioned earlier, I teach object-oriented programming using ActionScript in adifferent course.

Viewing tip

I recommend that you open another copy of this document in a separate browser window and use the following links to easily find and view the figures andlistings while you are reading about them.


  • Figure 1 . Flash Player output for a new Flex project.
  • Figure 2 . Browser output for a new Flex project.
  • Figure 3 . Application window background for alpha values of 0.0, 0.33, 0.66, and 1.0.
  • Figure 4 . Gradient output for narrow ratio zone.
  • Figure 5 . Flash window for Flex 4 project named AppBackground04.


  • Listing 1 . Skeleton mxml code for a new Flex 3 project.
  • Listing 2 . Flex 3 application named AppBackground01.
  • Listing 3 . Skeleton mxml code for a new Flex 4 project.
  • Listing 4 . Flex 4 application named AppBackground03.

Supplemental material

I recommend that you also study the other lessons in my extensive collection of online programming tutorials. You will find a consolidated index at www.DickBaldwin.com .

General background information

Download Flex

I have provided download links in Resources for both the free open source Flex SDKs and Flash Builder 4.

Flash Builder 4 includes the SDKs for both Flex 3 and Flex 4 along with an IDE that is useful for creating Flex applications. Both the raw SDK downloads and the Flash Builder 4 download includes a debug version of the AdobeFlash Player.

Install the Flex SDK

Installation of the free open source Flex SDKs is a little complicated (but I will explain how to do it in a future lesson) . I have provided a link in Resources for Installation and Release Notes.

Installation of Flash Builder 4 is straightforward, at least that is true for Windows. The download is an exe file. Just execute thedownloaded file and follow the installation instructions.

Getting started with the free SDKs

If you are using the free stand-alone SDKs, I will provide instructions for getting started creating applications with them in a future lesson. Thoseversions include a command-line compiler. You will need to create your mxml files using a text editor and compile them using the command-linecompiler.

Getting started with Flash Builder 4

If you are using Flash Builder 4, I have provided several links in Resources that will help you get started using the IDE. Perhaps the quickest way to get started is to view some of the videos at thelink titled Flex in a Week video training .

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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