newtTextbox doesn't show Scrollbar!?

#include <newt.h>
#include <stdio.h>

int main(void) {
 newtComponent form, text, button;
 newtInit();
 newtCls();
 text = newtTextbox(0, 0, 30, 5, NEWT_FLAG_SCROLL | NEWT_FLAG_WRAP);
 newtTextboxSetText(text,"Some really long text there that should fit multiple lines in order for scroll to have purpose, it's not shown there but it works, so you can scroll text without seeing actual scrollbar");
 button = newtButton(20, 5 + 2, "Ok");

 newtOpenWindow(5, 5, 34,
   12, "Test Texbox");

 form = newtForm(NULL, NULL, 0);
 newtFormAddComponents(form, text, button, NULL);

 newtRunForm(form);
 newtFormDestroy(form);
 newtFinished();
 return 0;
}