tooltips interferes with menu popup

Hi; anyone notice this problem before?  The menu.c sample program
gives code to pop up a window from the button press callback.  If
you attach a tooltip to the button, the menu no longer works

Sample code follows:

/* example-start menu menu.c */

#include <stdio.h>
#include <gtk/gtk.h>

static gint button_press (GtkWidget *, GdkEvent *);

int main( int argc, char *argv[] )
    GtkWidget *window;
    GtkWidget *menu;
    GtkWidget *menu_items;
    GtkWidget *vbox;
    GtkWidget *button;
    GtkTooltips *tips ;
    char buf[128];
    int i;

    gtk_init (&argc, &argv);

    tips = gtk_tooltips_new() ;

    /* create a new window */
    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
    gtk_widget_set_usize (GTK_WIDGET (window), 200, 100);
    gtk_window_set_title (GTK_WINDOW (window), "GTK Menu Test");
    gtk_signal_connect (GTK_OBJECT (window), "delete_event",
                        (GtkSignalFunc) gtk_main_quit, NULL);

    menu = gtk_menu_new ();

    for (i = 0; i < 3; i++)
	sprintf (buf, "Test-undermenu - %d", i);
	menu_items = gtk_menu_item_new_with_label (buf);
	gtk_menu_append (GTK_MENU (menu), menu_items);
	gtk_widget_show (menu_items);

    /* A vbox to put a menu and a button in: */
    vbox = gtk_vbox_new (FALSE, 0);
    gtk_container_add (GTK_CONTAINER (window), vbox);
    gtk_widget_show (vbox);

    /* Create a button to which to attach menu as a popup */
    button = gtk_button_new_with_label ("press me");
    gtk_signal_connect_object (GTK_OBJECT (button), "event",
	GTK_SIGNAL_FUNC (button_press), GTK_OBJECT (menu));
    gtk_box_pack_end (GTK_BOX (vbox), button, TRUE, TRUE, 2);

    /* This line breaks the popup menu */
    gtk_tooltips_set_tip(tips, button, "press this button", NULL) ;

    gtk_widget_show (button);

    /* always display the window as the last step so it all splashes on
     * the screen at once. */
    gtk_widget_show (window);

    gtk_main ();


/* Respond to a button-press by posting a menu passed in as widget.
 * Note that the "widget" argument is the menu being posted, NOT
 * the button that was pressed.

static gint button_press( GtkWidget *widget,
                          GdkEvent *event )

    if (event->type == GDK_BUTTON_PRESS) {
        GdkEventButton *bevent = (GdkEventButton *) event; 
        gtk_menu_popup (GTK_MENU (widget), NULL, NULL, NULL, NULL,
                        bevent->button, bevent->time);
        /* Tell calling code that we have handled this event; the buck
         * stops here. */
        return TRUE;

    /* Tell calling code that we have not handled this event; pass it on. */
    return FALSE;

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