Pricing issue

[tomek_gr]

Some simple configuration i guess.. since in virtuemart 1.8 things where diffent

I sell a product for 100,00€ 
the 100 have tax included 23%

The customer is bying the product for 100 and i his checkout he can see that
Price(without tax) = 77 euro
tax 23%  = 23 euro
Final Sale price = 100 (what he saw in the details product)

In older virtuemart i was entering
Product Price (Gross): 100  -> choosing my taxing option and
Product Price (Net):77 -> was calculated automatically

I can't find any way to make it work that way.. i guess someone has figuered that.. Please some direction on how to achieve that.. thank you!

[tomek_gr]

VIRTUEMART : 2.0.8e
JOOMLA : 2.5.6