kf_down?

Hello

I am trying to get kf_down to work. I'm using it with a Fl_Text_Editor.
Everything else works but I want to test my editor by placing
multiple lines of text saying "test" one on top of each other..

I'm just now sure how to use kf_down function. Would anyone be able to
give me a tip?

for (int i = 0; i < 100; ++i)

buff1->text("test");
Textedit2->kf_down(i,Textedit2);

Thanks