Possible problem with wchgat???

[Cy]

Okay, remember that I'm new to this here cursing (err, curses), so if
I'm wrong here, just tell me so and I'll shut up.  b-)

In the sample below, I expected the color of the "A" at 5x5 to change to
YELLOW on RED.  Try as I might, I just can't get it to happen.  Here's
the example code:

#include <curses.h>

int
main( int argc, char *argv[] )
{
    WINDOW *wstat;

    initscr();
    start_color();
    noecho();
    init_pair( 1, COLOR_YELLOW, COLOR_BLUE );
    init_pair( 2, COLOR_YELLOW, COLOR_RED );

    wstat = newwin( 0, 0, 0, 0 );

    mvwaddch( wstat, 5, 5, 'A' | A_BOLD | COLOR_PAIR( 1 ) );
    mvwaddch( wstat, 9, 9, 'Z' | A_BOLD | COLOR_PAIR( 2 ) );
    wrefresh( wstat );
    mvwgetch( wstat, 7, 7 );

    mvwchgat( wstat, 5, 5, 1, A_BOLD, 2, NULL );
    wrefresh( wstat );
    mvwgetch( wstat, 7, 7 );

    delwin( wstat );
    endwin();

    return 0;
}

Critter or just me being stupid???

Leland