Polymorphism

Hello all.

I'm a new programmer in this technologies. In my project, I
need to create some diferent objects, configured by the user in an
xml file. All these objects extends from Canvas and all are defined
in separated mxml files.



I am creating obect instances in runtime with
flash.utils.getDefinitionByName, but doesn't work. I've read some
articles and this feature works only in built-in classes. In
user-defined classes, it works whenever you define one var of your
desired type previously. I cannot do that.

My question is: Does exist another way to make this type of
polymorphism?



Thankyou very much in advance.

Polymorphism
getDefinitionByName() will only work if you already reference
the class somewhere else in your project. This is because the AS
compiler only compiles classes that are actually used. You can have
a whole load of files in your Flex project but the compiler won't
touch them unless they are actually referenced. So
getDefinitionByName isn't much use when you don't know in advance
what classes you will load.



However, in Flex 2.0.1 Adobe introduced Modules.
mx:ModuleLoader is a container that takes a url property as a
string. You could therefore read the names of the modules from your
XML file and then load them into a host container. You could then
build each component into a module and load it dynamically at
runtime.



More stuff on Modules
here