Add to Cart in other component

[skillz]

Hey Guys,

i use the newest virtuemart component for joomla and i am writing my own component for an configurator to choose products from the shop.
It's an standalone component. I have a problem in the frontend. I want a "add to cart" button in my component that the product would be added to the cart...
What i must include to use the functions of virtuemart??

I've looked in the views but this helped me not as much...
Hope you can help me guys...

EDIT: So the post to the cart site is done.. (with plugin jmproductimport) but how it works with ajax??

Merry Christmas!