How to add dynamic attributes?

Hi

I follow “HOW TO ADD DYNAMIC ATTRIBUTES TO A DEVICE CLASS”(http://www.tango-controls.org/resources/howto/how-add-dynamic-attributes-device-class/) to learn dynamic attribute, but i can’t do it.

In “HOW TO ADD DYNAMIC ATTRIBUTES TO A DEVICE CLASS” these is:

But i can’t find

in code generated by Pogo!

I use Pogo 8.4.5a on Ubuntu 14.04, what’s the problem?
Could anybody help me to use dynamic attributes in device?

thanks