MFC中按下Buttonbutton，弹出一个窗体的同一时候关闭本窗体

CMyDlg *dlg = new CMyDlg();                //新建一个CMyDlg对象

this->ShowWindow(SW_HIDE);             //隐藏父窗口                                         

dlg->DoModal();                                       //弹出子窗口