第一个是登录窗口

点击“进入WINCC”之后是一个主窗口，C脚本是：

#include "apdefap.h"
void OnLButtonDown(char* lpszPictureName, char* lpszObjectName, char* lpszPropertyName, UINT nFlags, int x, int y)
{
#pragma code("useadmin.dll")
#include "PWRT_API.H"
#pragma code()
if (strcmp(GetTagChar("@CurrentUser"),"")==0)
{
MessageBox (NULL, "请先登录用户!" , "提示", MB_ICONEXCLAMATION| MB_SYSTEMMODAL );
}
else
{
OpenPicture("main.Pdl");  
SetWidth(lpszPictureName,"main.pdl",1024);
SetHeight(lpszPictureName,"main.pdl",900);
}
}

结果是：

窗口还是登录窗口那么大，我怎么能让这个窗口自动变大那？