[fpc-pascal]WriteLn call in ncurses - help needed

[Santucco]

Hello :-)!

I'm porting a DOS application into Linux.
This application use propriertary window library, particularily based on CRT and
low-level DOS calls.
I'm using ncrt.inc instead of CRT and low-level DOS calls.
But I have a problem calling WriteLn from application part. 

A window is scrolled by placing cursor at the end of last line and calling
WriteLn. This call cleans current line and scrolls window by one line.

Why is the current line being cleaned?  What ncurses window parameter must (or
can) I set  to solve this problem?

(It's not permitted to change the application part, that calls this function).

Best regards,
  Santucco