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It's been a long time ago, but I think I remember in 10g there was a property on the Group that allowed you to turn off the default + and - icons.
If this is the case, you could add a new + button that had a method that would add a new row to the group. Every time this button was clicked you'd increment a counter. Using this you'd track how many times it had been clicked and then disabled after the button after it was clicked twice.
Hope this helps,