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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

Preface

General

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

what is the meaning of extended family
Shellyann Reply
extended family is two are more nuclear family living together under one roof
Nordalee
what is genetic engineering
Ebot Reply
good day please what is a cell?
Colota Reply
cell is the basic unit of all living things/organism
Hassan
differenciate b/w cilia and flagellum
Abshira
Cilia: 1. They are smaller in number. 2. Cilia usually occur throughout or major part of the surface of a cell. 3. They beat oar like and in a co-ordinated rhythm 4. Cilia help in locomotion, feeding, circulation, etc.. 5. Example: Paramecium
iti
Flagella: 1. They are larger in size. ADVERTISEMENTS: 2. Flagella are commonly found at one end of the cell. 3. The flagella beat whip-like and independently. 4. Flagella help in locomotion. 5. Example: Euglena
iti
smallest structural and functional unit of an organism!
zidane
cell is the basic unit of all living things
Lukman
what is homeostasis
alex Reply
the ability of an organism to maintain stable internal environment, even when the external environment changes
Bee
what's the function of the hypothalamus
Agyekum
what is homeostasis
Edward Reply
constant maintenance of internal body temperature
Agyekum
What is the function of the Pituitary Gland?
WeNdlovu
how can homeostasis be maintained?
alex
pituitary gland also known as the master gland secretes hormones which triggers other gland to secretes their hormones
Agyekum
what's the full meaning of DNA and RNA
Deborah Reply
DNA is Deoxyribonucleic acid and RNA means Ribonucleic acid
Christian
sha is mitochondria?
Sparrow Reply
what is biology
Femi Reply
biology is the study which deals with the study of the biological components or animal and plants.
Juhi
biology is the study of life.
Roger
biology is the branch of science which deals with study of two parts 1.botany&2zoology these is known as biology....
Chetan
biology is the study of human beings ...
Chetan
Biology is a branch of science that deals with the study of nature
Agyekum
biology is the science of living organism
Abshira
biology is the branch of science that deals with study of living organisms
Lukman
what is neculer cell?
is it nuclear cell?
iti
asthma occur in which part of the body organ?
Festus Reply
Lungs
NICHOLAS
lungs
marian
heart
Cynthia
can you explain to me why you say heart is the answer
marian
what is hemoglobin
Lucky Reply
a protein that carries oxygen, it is found within red blood cells
EmmyOrangePeel
Apart from endocrinology, what other alternative should be done to a D/m client
Deborah Reply
good day please what is excretion
Blaise Reply
excretion is the process by which metabolic wastes and other none-useful materials are eliminated from an organism.
Petrene
its the process of eliminating or removal of metabolic waste and non useful materials from an organ.
eyong
Its the removal of metabolic waste product from the body
Boo
it is the removal from the body of living organisms, toxic waste products of metabolism which if allowed to accurate can cost harm to the body..
Renzo
how are protons formed?
Brian Reply
What is isotopes?
Brian
isotopes is a phenomenon in which atoms of the same element has the same atomic number but different mass number due to a difference in their neutron number or relative abundance in the earth crust
Efosa
give me more mcqs there r just two mcqs
Salma Reply
Define the term Disease in one paragraph.
Sutanya Reply
Disease is any disorders that counteract with the normal performance of the immune system.
Agyekum
what is cell?
Colota
Cell is the basic unit of life It is the building block of an organism
Agyekum
do agree with me that if someone needs to truely be a biologist he should be mathematician physicist & chemist in oreder to acheive the level #biologist
Assila
what is a protoplasm?
Colota
colourless living part of the cell
Jenny
what is protoplasm made up of?
Jack
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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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