My REST service returns a,b,c,d values for every item
I need to compute and show the result of (a+b)-(c+d) operation into every list item.
Can i compute the value during mapping?
How do i reference in javascript mapping of "myResultLabel" the values of a,b,c,d ?

I solved without using the so powerful custom component feature.
I should spend more time to experiment with what I have on hand to finish the application.
This system is really fantastic and your support very helpful.

i need to open a popup from a button included into the custom component.
I can't find a way to do that.
Is it that possible?

Many thanks.
I had completely misunderstood the functioning.
Is it right that this the only way to copy or move component from page to page?
Is there a way to move/copy/share components from app to app?