You mean the 'drawing' of a profit / loss box ?
AFAIK there is no way of accessing properties of components, except for the 'custom' Trendline in the study_examples folder of the 'basic SDK starters package'.
So I'm afraid you'll have to code such a box yourself first (it's actually only three lines, a few calculations and 2 fills) or mail MW to ask for the source code of the box included in the platform. I doubt they will provide it though