运行程序后，生成一个纯透明的对话框，且它是置顶的。因此鼠标点击的焦点都被该对话框接收，因此给用户的感觉是鼠标失效。按Alt+D解除。-After running the program to generate a transparent dialog, and it is to be the top. Therefore the focus of the mouse clicks have been received in the dialog box, so it give users the