How to populate price for new calculated pricing field in product configurator

Hi,

I want to display one new pricing field in product configurator which populates summation of child product prices.I have implemented but it is not showing the total bundle price immediately after selection of product. The price is displaying only if the page is refreshed or if i select another product, price is displaying for old product.

I have added one condition in the step  "Customizable Product Roll-Up"  in "Dynamic Pricing Procedure WF".

Condition:-   On Parent Row 1     Literal      {Row.SP Config Price} = Sum({Children}, 'Net Price') + Sum({Children}, 'SP Config Price')

"SP Config Price" is the field which displays the summation of child product prices.