Radio Button not displaying in product listing.

-- HikaShop version -- : 2.6.4
-- Joomla version -- : 3.6.5
-- PHP version -- : 5.6.29
-- Browser(s) name and version -- : Chrome

Dear Sir.

I don't know what i am doing wrong.

I need to put radio buttons in selections of products .

I have for example e computer as a product and also i have characteristics as RAM, Hard Disk, etc...

RAM a 1GB, RAM b 2GB... etc..
also Hard Disk a 100 Gb , b 500 Gb.. etc...

Of course the total price is depends from the selection.

I crate drop down but its not useful, cause i want the user to see with one look the possible options.

If i put characteristics on the product page, i need to add many variables and this is not useful and difficult to set .

Thank you for reply Nicolas.

As your opinion, i think is good not to use the "radio" type button, in my case.

But i think that sometimes the customers wants to see with a first look what the product also contains without using dropdown menu.

So, as about the code editing, no i will leave it as it is.

Thank you for the reply.