How to draw a colorful border using wborder ?

[John Daker]

Hi all
I want to draw a border with blue background white line, and my code is:

win=newwin(15,70,15,300);
werase(win);
init_pair(1,COLOR_WHITE,COLOR_BLUE);
wattrset(win,COLOR_PAIR(1));

int x,y;
for(y=0;y<15;y++)
for(x=0;x<70;x++)
waddch(win,' ');
wborder(win,0,0,0,0,0,0,0,0);

But the border's background is black while other area is blue, How to draw a colorful border using wborder ?

Thanks