Accessing a button in a Component from other component

I have a two components Test_Interface.mxml & teacher_fullscreen. I called teacher_fullscreen.mxml from Test_Interface.mxml by
              private var tfull:teacher_fullscreen = new teacher_fullscreen();
              tfull.title = "Teacher Window";
              tfull.maximizable=true;
              tfull.systemChrome = 'none';
              tfull.minWidth = 800;
              tfull.minHeight = 600;
              tfull.open();
Now I created an instance of Test_interface in my 2nd mxml by
public var par:Test_Interface=new Test_Interface();
Actually, I wanted to disable a button in Test_interaface.mxml with id = "b1" from my 2nd mxml using the object created above.
So I gave par.b1.enabled=false; It did not give any compile errors but during run time cannot access object or method of null reference sandbox error was returned for the statement par.b1.enabled=false. So how do I change the property of a button in one component from other. Please Help me.

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.

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MyModule
<?xml version="1.0" encoding="utf-8"?>
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Accessing a button in a Component from other component

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