Custom fields with stock control - not show

[vawaver]

Hello,
I would like to ask somebody to help me with the problem.
I have installed Full installer includes Joomla with VirtueMart installed 2.6.0a with sample data on Joomla 2.5.20
I trying to learn how it works.
I would like to create product with sizes and colors based on tutorial http://goo.gl/oxBdR6
Problem is that I do not see plugin "Custom fields with stock control" in dropdown menu when I try to create new custom field.
I have installed AIO package too but it does not help.

All source packages were downloaded from http://www.virtuemart.net/download

I will be glad for a suggestion.
Thank you for your reply.

[vawaver]

Adding screenshot with available options.

[attachment cleanup by admin]

[Wesley van Wyk]

You use the stockable option. The creation of that video was a long time ago, but gives you the general idea.

Once that is done, add your child products and put stock into them. give them new SKU's and an alias. Once the child products are created, then you go to your Parent product and add the custom plugin, and then you connect them with their relevant child products.