Difficulties in making Transparent Shadows

I followed the tutorial from blenderwiki
http://mediawiki.blender.org/index.php/Tutorials/Modelling_A_Cube
I supposed the final product should be this:

http://mediawiki.blender.org/uploads/1/12/Tutorials-cube_materials_render.jpg

However , i cant make the Transparent Shadows although i was enabling the TraShado and Ray Transp.
My product is as follows:

https://eportal.cityu.edu.hk/bbcswebdav/users/50695169/dice.jpg
My product which does not has a Transparent Shadows such as the tutorial one…

Could someone tell me what’s going wrong??Thank you so much!
here is the file:
https://eportal.cityu.edu.hk/bbcswebdav/users/50695169/DICE.blend

You need to enable TraShadow on the plane - and Ray Transparency on the die. Nice work so far.

Thank you so much ,l3la . It is work~! vbmenu_register(“postmenu_808614”, true);