private void ClearMenu()
{
IntPtr existingMenuList = Gtk.Widget.GetChildren(menuBarHandle);
for (uint i = 0; i < GLib.GetListLength(existingMenuList); i++)
{
var existingMenu = GLib.GetListNthData(existingMenuList, i);
Gtk.Widget.Destroy(existingMenu);
}
GLib.FreeList(existingMenuList);
}