ToolTip 气泡控件问题

HWND hTip = CreateWindow(TOOLTIPS_CLASS,
                                 NULL,       //气泡提示
                                 WS_POPUP | TTS_BALLOON,
                                 0, 0, 0, 0,
                                 hWnd,
                                 NULL,    // 注意这里需为NULL
                                 GetModuleHandle(NULL),
                                 NULL);     // 消息提示（气泡）
        //注册气泡控件
        WCHAR tip_str[MAX_PATH] = L"你好啊，我是气泡提示！！！";
        TOOLINFOW ti;
                 ti.cbSize = sizeof(TOOLINFO);
                 ti.uFlags = TTF_SUBCLASS;
                 ti.hwnd = hButton;  //在哪个窗口或控件上显示消息
                 ti.uId = (UINT_PTR)hTip;   // 气泡控件句柄
                 GetClientRect(hWnd,&ti.rect);  // 客户区
                /* ti.rect.bottom = 0;
                 ti.rect.left = 0;
                 ti.rect.right = 0;
                 ti.rect.top = 0;*/

                 ti.hinst = GetModuleHandle(NULL);
                 ti.lpszText = tip_str;
        SendMessage(hTip,TTM_ADDTOOL,0,(LPARAM)&ti);
        //设置提示文字宽度，可以多行显示            //提示消息的宽度
        SendMessage(hTip,TTM_SETMAXTIPWIDTH, 0, 1024);
        //显示前延迟                                             //单位 毫秒
        SendMessage(hTip, TTM_SETDELAYTIME, TTDT_AUTOMATIC, MAKELPARAM(100, 0));
        //显示后延迟                                             
        SendMessage(hTip, TTM_SETDELAYTIME, TTDT_AUTOPOP, MAKELPARAM(999999999,0));