From EduTechWiki - Reading time: 3 min
This page is part of the Flex tutorials.
Update: This product is now called Flash Builder. As of April 2010 the current version is Flash Builder 4
Adobe Flex Builder is an Integrated Development Environment (IDE) for developing flex/actionscript/flash applications.
See also:
The various freely available online documentation for Flex Builder is very good (much better than for the CS3 tool I believe). Therefore we won't (for the moment) make this a real tutorial.
Like most IDEs you can't just edit a little file, but you need to define a new project: File->New; Flex project.
Just copy and paste some code. E.g. get some code from the Flex datagrid component tutorial.
You should see something like this, i.e. the MXML code in "source mode".

Click on the Design TAB and drag the component to the stage (.e.g. a label on top and a datagrid below) You should see a components selector to the left and something like in the picture below (after editing the code in "source mode").

Of course it's more complicated than that, but these 3 steps summarize the procedure :)
Flex builder allows to create a project structure according to your needs and to edit both MXML and AS files. I also communicates with the Flex (MXML) compiler that generates the *.swf and *.html.
Diagrams error (with plantuml command): /bin/bash: line 1: plantuml: command not found
An application project includes typically three kinds of files (as in the figure above): source code, multimedia assets and libraries. These will go into the src directory structure. When you create a new project, Flex builder will create the following directories (this setup can be changed somewhat):