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Learn about some of the differences between Flex 3 and Flex 4. Learn how to write a Flex application that controls the color, color gradient, and transparency of the background of the main window when a Flex application is played in Flash Player.
Click AppBackground01 and AppBackground04 to run the Flex 3 and Flex 4 projects discussed in this lesson. (Click the "Back" button in your browser to return to this page.)

Table of contents



This lesson is part of a series of tutorial lessons dedicated to programming with Adobe Flex.

What is Adobe Flex?

The previous lessons in this series have primarily dealt with XML issues and have nibbled around the edges of Flex. At this point, it is time to get reallyserious about Flex and start understanding what Flex, (as an XML programming language) , is all about.

According to one of the pages on the Adobe website,

"Flex is a highly productive, free open source framework for building and maintaining expressive web applications that deploy consistently on allmajor browsers, desktops, and operating systems. While Flex applications can be built using only the free open source framework, developers can use AdobeFlex Builder software to dramatically accelerate development."

Subsequent to the original publication of this lesson, Adobe has released Flex version 4 (in addition to Flex version 3) and has replaced the Flex Builder 3 IDE with a new IDE named Flash Builder 4.

Flash Builder 4 supports both Flex 3 and Flex 4.

As of June 2010, Flex Builder 3 is no longer available, but Flash Builder 4 isavailable for downloading and is free for educational use .

I have updated this lesson to accommodate the availability of Flex 4 and Flash Builder 4 in addition to Flex 3.

Although Flash Builder 4 is very similar to Flex Builder 3 from a user perspective, there are numerous differences between Flex 3 andFlex 4. I will touch on some of these differences in this lesson and will explore them in more detail in future lessons.

Download links

Download links for the free Flex 3 and Flex 4 frameworks, as well as theFlash Builder 4 IDE are provided in Resources .

Powerful but more complicated

Flex 4 is more powerful, but also significantly more complicated than Flex 3. Therefore, it isn't clear to me that developers will want to make animmediate switch to Flex 4. Therefore, I will continue publishing material on Flex 3 in addition to Flex 4.

Is there a tipping point?

Anything that can be programmed in Flex can also be programmed directly in ActionScript, but the reverse is not true. It occurs to me that at some point, asFlex becomes more complicated, there may be a tipping point where developers will simply switch to ActionScript instead of expending the effort necessary to learn about new more-complicatedaspects of Flex.

Questions & Answers

so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
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
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Introduction to xml. OpenStax CNX. Dec 02, 2014 Download for free at https://legacy.cnx.org/content/col11207/1.18
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