Can we show blank lines for transient VO?

I'm a newbie.. Using JDev 11.1.1.2.0.
I have a requirement like this (simplified): On first page show an editable table with 2 columns: part no and date, and 10 blank rows. On hitting submit, it should go to a second page which has the part number, date, and price (from database API).
I went thru storefrontdemo example and I see they have used a transient VO for the cart. So I created a transient VO with 3 attributes - part number, date and price. Also created an AM method in the Impl class to get the price for a part/date combination.
Few questions:
1. How can I show the first page with blank rows? When i drag and drop the VO from data control palette as an editable table, I get no rows.
2. Is it wise to invoke the AM method for each row and populate the price on the transient VO attribute? Will the transient VO values display on the second page, assuming both the first and second pages are in a task flow?
Thanks in advance!
Kalp
Edited by: user514831 on Jan 17, 2011 1:56 PM

Answering my own question - I just added a CreateInsert operation from data control palette and rewired the "Method" to a custom bean that does something like:
Row row = vo.createRow();
vo.insertRow(row);

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