Dynamically modifying the number of Form detail rows

Hi,
A challenge for you all!
I am building a product details system in Portal forms.
One of the screens is a Product Ingredients form with Product as the master block and ingredients as the Detail block. There can be between 1 and 20 ingredients in any 1 product and as these all have to sum to a volume percentage of 100% the client would like to see all ingredients for a product on 1 screen and not have to do Next/Previous to see them all.
As you increase detail rows on a master detail form the performance of the form decreases dramatically so I would like to minimise the number of detail rows displayed for each product to maximise performance.
To this end I wish to dynamically modify the number of detail rows displayed to match the number of ingredients on a product as that product is queried.
I can handle figuring out how many rows I want to set the page to but have not been able to figure out how to change the number of detail rows displayed at run time.
Anyone know how (or if!) this is possible ?
All help gratefully recieved
Andy

The rownum pseudo-column hold the number of the row but it doesn't work like you expect. It is assigned before sorting for example and it is not absolute. SQL conceptually deals with sets and sets have no inherent order. See http://www.oracle.com/technology/oramag/oracle/06-sep/o56asktom.html
If you want to have an absolute number in a row you will need to maintain it yourself with PLSQL code.

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