save_button = function(x, y, r)
	return overflowable_button('save', x, y, r,
		function()
			Show_menu = nil
			if Current_pane.filename == nil then
				Show_file_dialog = true
				File_dialog_callback = function(filename)
					if filename == '' then return end
					Current_pane.filename = filename
					one_time_save()
				end
			else
				one_time_save()
			end
		end)
end