[Q] Plugin Soomla in-app purchasing

Who have a deal with soomla plugin?
Soomla is a good instrument. But i cant understand one thing.
May be its a property of markets, but no property of Soomla.... why displaying price on my device in currency, that i have pointed at the market (i.e RUB).
i want to have price in $ fo US, euro for EuroCountries.... etc
when i push Buy button, there is a price in right currency in google window (native for account ).

Problem is only for this code:

PurchasableVirtualItem item = (PurchasableVirtualItem)StoreInfo.GetItemByItemId( itemId);
if(item == null)
return "--.--";
PurchaseWithMarket purchaseType = (PurchaseWithMarket)item.PurchaseType;
return purchaseType.MarketItem.MarketPrice;