under ncurses, mouse events come as escape codes

[Adam H. Peterson]

I apologize if this is off-topic for this group.  I'm having difficulty 
finding a forum to ask help in using ncurses, so here goes....

I'm having difficulty reading mouse events under NCurses.  Instead of 
receiving KEY_MOUSE from getch(), I'm getting escape codes.  For 
example, this program:

#include <ncurses.h>
#include <stdio.h>
#include <stdlib.h>

int main() {
  initscr();
  clear();
  noecho();
  cbreak();
  mousemask(ALL_MOUSE_EVENTS, NULL);
  for (;;) {
    int ch=getch();
    switch (ch) {
    case KEY_MOUSE:
      {
        MEVENT event;
        getmouse(&event);
        printw("A mouse event occurred\n");
        refresh();
      }
      break;
    case 'q':
      endwin();
      exit(0);
    default:
      printw("Key %d occurred\n", ch);
      refresh();
    }
  }

}

When I click on the terminal window, I don't get "A mouse event 
occurred" but instead I get:
Key 27 occurred
Key 91 occurred
Key 77 occurred
Key 32 occurred
Key 62 occurred
Key 43 occurred
Key 27 occurred
Key 91 occurred
Key 77 occurred
Key 35 occurred
Key 62 occurred
Key 43 occurred

(I assume the key 27 begins the escape sequence for mouse down and the 
second one begins the sequence for mouse up.)

Is there anything I'm doing wrong?

I'm using a gnome terminal, by the way, but I tried it under an XTerm 
and got the same results.