add glutInitWindowPosition calls
diff --git a/progs/demos/tessdemo.c b/progs/demos/tessdemo.c
index 66fdc63..26403ee 100644
--- a/progs/demos/tessdemo.c
+++ b/progs/demos/tessdemo.c
@@ -505,6 +505,7 @@
 
    glutInit( &argc, argv );
    glutInitDisplayMode( GLUT_SINGLE | GLUT_RGB );
+   glutInitWindowPosition(0, 0);
    glutInitWindowSize( 400, 400 );
    glutCreateWindow( argv[0] );