设定Gtk menu 上的文字属性，比如字体和颜色

 使用gtk_menu_item_new_with_label生成的menuitem里面都有一个Label，直接取得其child设置即可

 {

 GtkMenuShell *menu;

 GtkWidget *menuitem;

 menuitem=gtk_menu_item_new_with_label("hello");

 gtk_container_foreach (GTK_CONTAINER(menuitem), menu_set_text, NULL);

 gtk_menu_shell_append(menu,menuitem);

 gtk_widget_set_size_request (menuitem, 120, 35);

 gtk_widget_show(menuitem);

 gtk_menu_popup(GTK_MENU(menu), NULL, NULL, popmenu_set_position, NULL, ev->button, ev->time);

 }

 void menu_set_text(GtkWidget * w)

{

 g_return_if_fail(w != NULL);

 char *bold_text=NULL;

GtkLabel* label = GTK_LABEL(w);

g_return_if_fail(label != NULL);

 bold_text = g_markup_printf_escaped ("<span weight=/"bold/">%s</span>", gtk_label_get_text (GTK_LABEL (w)));

gtk_label_set_markup (label, bold_text);

 }