Here’s an example I created to bind a text field with a label. This needs to be done with you are dynamically creating components inside of your app instead of using MXML. Be sure to use the if statement on the unwatch function to avoid an error for null pointing.

private var watcher:ChangeWatcher;

private function watch():void {
var SampleLabel:Label = new Label();
SampleHBox.addChild(SampleLabel);
watcher = BindingUtils.bindProperty(SampleLabel,"text", sampleText,"text");
}

private function unwatch():void {
if (watcher != null) {
watcher.unwatch();
}
}

Here’s a great tool to help with Flex debugging. Put <mx:TraceTarget /> into your code and run your app in debugging mode.

You will see valuable debugging information appear in the console area. Great for hassling with remoting like ColdFusion CFC’s.

Form more info: Adobe Flex 3 Language Reference TraceTarget

I have a Flex project that I copied in from another source to work on. I changed around some output properties and library paths via the Properties context menu for the project. The changes would hold while Flex was open, but it would never update the .actionScriptProperties file, thus when Eclipse was restarted, the changed would revert.

After doing a little bit of Googling on the issue and not finding much help I ended up making a backup copy of the folder, deleting the folder, and importing the files into the new folder via Flex Builder. This fixed the issue. Not sure what caused this, but it works now.