Master detail forms..increase the detail rows by clicking a button

hi all,
i have a problem, in my master detail form i have set the details rows as 8. can i give an option to the user such as a button, on clicking which he can increase the number of detail rows by say 2 or 3.
can any one help me out on this???
Thanks in Advance
Rajesh

Hi Rajesh,
This is not posible in the current model of the portal forms , the no of detail rows can be set only at the design time.
rahul

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