Extension Builder for Flash CS6 is not working

Question

Hi I'm trying to make an extension for Flash CS6, using Extension Builder 1.5
When I run the extension from Flash Builder, Flash CS6 opens up, but the extension doesn't show up under Window>Extensions menu.
I'm just trying with an empty extension.
Note: If I create another extension for Photoshop, it works fine.

Answer 1

//resize 100*100
window.width = 100;
window.height = 100;
//position 300,300
window.nativeWindow.x = 300;
window.nativeWindow.y = 300;