We need more information.
1) Is this an AIR application?
2) What is the name of the main app MXML file??
3) Please boil this down to a minimal yet complete set of code files and post the entire code here for all files.
I think based on what you mentioned you should be able to boil it down and post just a few lines of code for each file and the answer to your problem should come soon. But with the error you are getting it is too easy to make assumtions that may not reflect your situation.
you can use this construction par.b1.enabled=false
but you should understand that it's possible after full creation of the component.
So you can call this only after creationComplete event dispatched from your Test_Interface.
Another way to create a public bool variable in Test_Interface and bind your button enabled property to this varible. This way you don't need to listen any events.
Hope this helpful.
Thnx... It worked when I converted the Bindable variable to static type.