[Bindable] causes compilation errors (definition not found) ?

Question

I'm trying to build a simple actionscript project, where an
embedded gif is moving around the screen.
Without the [Bindable] tag it works fine, with [Bindable] it
throws:
1172: Definition mx.binding:BindingManager could not be
found. hello2.as hello2 line 1
1172: Definition mx.binding:BindingManager could not be
found. hello2.as hello2 line 1
1172: Definition mx.core:IPropertyChangeNotifier could not be
found. hello2.as hello2 line 1
1172: Definition mx.core:IPropertyChangeNotifier could not be
found. hello2.as hello2 line 1
1172: Definition mx.events:PropertyChangeEvent could not be
found. hello2.as hello2 line 1
1172: Definition mx.events:PropertyChangeEvent could not be
found. hello2.as hello2 line 1
1172: Definition mx.utils:ObjectProxy could not be found.
hello2.as hello2 line 1
1172: Definition mx.utils:ObjectProxy could not be found.
hello2.as hello2 line 1
1172: Definition mx.utils:UIDUtil could not be found.
hello2.as hello2 line 1
1172: Definition mx.utils:UIDUtil could not be found.
hello2.as hello2 line 1
1120: Access of undefined property PropertyChangeEvent.
hello2.as hello2 line 12
I looked in the docs, there is no mx.binding package at all.
Is this a flex bug or what? Source is below.
package {
import flash.display.Sprite;
import flash.events.*;
import mx.core.BitmapAsset;
public class hello2 extends Sprite
[Embed(source="assets/back.gif")]
[Bindable]
private var bar:Class;
private var foo:BitmapAsset;
public function hello2()
foo = new bar();
foo.smoothing = true;
addChild(foo);
foo.y =100;
addEventListener(Event.ENTER_FRAME, this.onEnterFrame);
stage.frameRate = 50;
private function onEnterFrame(event:Event):void
foo.x++;

Answer 1

I think you need to bind the asset outside of your class
declaration like this:
package {
import flash.display.Sprite;
import flash.events.*;
import mx.core.BitmapAsset;
[Embed(source="assets/back.gif")]
[Bindable]
private var bar:Class;
private var foo:BitmapAsset;
public class hello2 extends Sprite
public function hello2()
foo = new bar();
foo.smoothing = true;
addChild(foo);
foo.y =100;
addEventListener(Event.ENTER_FRAME, this.onEnterFrame);
stage.frameRate = 50;
private function onEnterFrame(event:Event):void
foo.x++;
Let me know if that doesnt work, i have allot of questions
about packages myself and havent got much help on this forum yet.
Hopefully as more people get better at flex that will
change.