Force cart prices calculation

[SinyaWeo]

Hello,

is there a way to force VirtueMart ( 2.0.20b on Joomla! 2.5.8 ) to recalculate product prices in the cart?

Prices are changed according to total cart weight and one has to push the double arrow button (for changing quantity) twice or hit F5/CTRL+R reload.
What I need is after this price change call some function which will recalculate the cart contents and will show the right prices.

Anyone please encountered this problem?

Milan