为什么用了draw_text文字显示不出来？

受pia专用ID

$botton_viewport = Viweport.new(0, 0, 544, 416)
$window = Window.new($botton_viewport)
$window.x = 0
$window.y = 0
$window.width = 544
$window.height = 416
$window.windowskin = Cache.system("Window")
$window.contents.draw_text(0, 0, 255, 24, "6565f5e5")
Graphics.freeze
Graphics.transition(0)
loop do
  $window.update
  Graphics.update
end
输入如上脚本后运行，窗口显示出来，但内容显示不出，如何解决？

orzfly

在$window.contents上面加上
$window.contents=Bitmap.new(400, 300)