一个很好的对话框界面的例子，告诉你怎样设置一个位图作为对话框的的背景图片，不过要注意必须是picture的Tab顺序为1才能使其他控件不被覆盖。-a good example of the dialog interface, tell you how to set up a bitmap as a dialog of the background image, but to the attention of the picture mu