gtkdialog: menuitemseparator widget reference

# menuitemseparator widget A GtkSeparatorMenuItem ## Definition
    <menuitemseparator></menuitemseparator>
## Tag Attributes None. ## Directives None. ## Notes This widget was introduced in version 0.7.21. button, checkbox, chooser, colorbutton, comboboxentry, comboboxtext, combobox, edit, entry, eventbox, expander, fontbutton, frame, hbox, hscale, hseparator, list, menubar, menuitemseparator, menuitem, menu, notebook, pixmap, progressbar, radiobutton, separator, spinbutton, statusbar, table, terminal, text, timer, togglebutton, tree, vbox, vscale, vseparator, window,