本人乃编程爱好者，这个小程序实现的是对话框的收缩和扩展，虽然很简单，但是相信对初学者是很有帮助的，内有详细步骤！-I was programming enthusiasts, this small program is the contraction and expansion of the dialog box, although very simple, but believe that is very helpful for beginners, which has detailed st