Cannot extend mx.core.Application

Question

I am trying to create a AS3 only project with no mxml but I
would like to use the mx.controls
I created a simple class
package {
import mx.core.*;
import mx.containers.*;
import mx.controls.*;
import flash.display.*;
public class Test extends Application {
public function Test(){
The code compiles fine but generates errors during runtime
TypeError: Error #1006: Call attempted on an object that is
not a function.
at mx.core::Container/mx.core:Container::createBorder()
at mx.core::Container/styleChanged()
at mx.core::Application/styleChanged()
at mx.managers::SystemManager/
http://www.adobe.com/2006/flex/mx/internal::addingChild()
at mx.managers::SystemManager/::initializeTopLevelWindow()
at mx.managers::SystemManager/::frameEndHandler()
thanks
cheers :)
firdosh

Answer 1

We've made subclassing components in AS straightforward, but
subclassing Application isn't trivial. There is some support code
that an Application needs thatI the MXML compiler sets up. think
you're running into the problem that you don't have a global CSS
selector. (The MXML compiler parses default.css and creates
ActionScript that sets up the CSSStyleDeclarations that the
application needs.) We can probably make this easier in the next
release, but it's unlikely to get better for Flex 2. Is there some
particular reason why your app can't be an MXML file, or it is just
a preference?
Another possibiliy is to turn on the
keep-generated-actionscript option, compile an empty
<mx:Application/> app, look at the subclass of Application
that the MXML compiler produces, and copy any relevant -looking
autogenerated code you find there.