TimeOnDropped( ) problem

 
Hi all!
I have a litle problem with that function TimeOnDropped( ) and PriceOnDropped()
When i add this to my start function of my indicator it returns me 0
Anyone knows why?

Start()
{
Comment(PriceOnDropped()," ",TimeOnDropped());
}
 
https://www.mql4.com/docs/grp_windows/timeondropped/
See note. "For custom indicators this value is undefined."
 
:( I read that and thought that it will not work like it supose too.
But mabye there is some way to implement that kind of functionlality in cutsom indicators?
 
There is problem with new subwindow for indicator (WindowOnDropped function). For indicators this function returns its window number that may be differ from number of window on wich indicator was dropped
Reason: