calling gtk_menu_popup from a button's "clicked" signal

[Hubert Sokołowski <h sokolowski wsisiz edu pl>]

Hi!

I have a GtkMenu which I want to popup when a user clicks a button.
my function that is called when user clicks the button looks like this

void
on_zamowienia_button_print_clicked     (GtkButton       *button,
                                        gpointer         user_data)
{
...
}

How do I get the GdkEventButton here so I can pass the time and button
values to gtk_menu_popup ?

thanks in advance
hs