The problem is that I intent to compile the project, as it is, with the mxmlc command of Flex 4 SDK and I do not obtain a SWF file because of compilation errors.
Like you say, an error message about the style appear (sorry, I have only the french version of this message) when I intent to compile each program for Flex 3.

Thank you very much Cliff.
I tried this and I found common problems on with the migration of an application from Flex 3 to Flex 4.
To solve some of them, look at : http://www.lynchconsulting.com.au/blog/index.cfm/2010/3/21/Flex-3-to-Flex-4-Migration-Howto

I decide to go back on Flex 3 because Flex 4 is to young.
Regards

Willy

Hi everybody,
First, I am Willy, a French student in ITs and I am on a Flex 4 project. The project is to do a timeline application.

My problem is I do not manage to do a simple "Hello World" application by keeping truly the PureMVC architecture.

I have to develop without the Flash Builder IDE; only with free applications available on Ubuntu (thus text editor).
Can someone guide me to develop a first "Hello World" application which I would translate in French ? Or give me a simple application that I could compile knowing the last step is to develop an RIA/RDA application ?

Regards
Willy D.