stage3d don't work!

[flashCS6]

hello i've downloaded flash pro CS6

i want to test 3d stage...

i added: 

import flash.display.Stage3D;

var stage3d = new Stage3D();

at the first fotogram but it get error:

Unable to instantiate the class Stage3D$

i don't know why it don't work! i set as3 and flash player 11.2!!!

same problem on flash pro CS5.5!!!

[kglad]

that's not how to instantiate a Stage3D instance.  use:

var stage3d:Stage3D = stage.stage3Ds[0];

p.s.  you might want to read about Stage3D:  http://www.adobe.com/devnet/flashplayer/articles/how-stage3d-works.html