MFC非客户区重绘问题，高手进！
有一个父窗口DLG_PARENT和一个子窗口DLG_CHILD，父窗口上有按钮button点击DoModal()方式连接到子窗口，父窗口PARENT和子窗口DLG_CHILD的客户区和非客户区都用BMP做背景图
问题是这样：单击父窗口的Button打开子窗口，然后不关闭子窗口，再点击任意可见的父窗口位置，发现子窗口DLG_CHILD的非客户区背景图不见了，客户区背景还在。
问这是什么原因，怎么解决？
越详细越好，谢谢啦！
[最优解释]
可能是你的非客户区重绘写的有问题？你刷新一下父窗口看看能显示非客户区不？
[其他解释]
问题补充：我在OnEraseBkgnd()和DefWindowProc（）函数里都调用了非客户区重绘函数！谁给个例子，详细点的，高手帮忙啊！
[其他解释]
我的非客户区重绘函数是这样的，请帮忙看看！
void CDataBaseImport::DrawDlg(void)
{
CDC* pDC = GetWindowDC();
int nTitleHeight = GetSystemMetrics(SM_CYCAPTION);
CRect wndRC;
GetWindowRect(wndRC);
wndRC.OffsetRect(wndRC.Width(),wndRC.Height());
int nborder = ::GetSystemMetrics(SM_CXFIXEDFRAME);
if(GetStyle()&WS_THICKFRAME)
{
int nborder = ::GetSystemMetrics(SM_CXBORDER);
}
CBitmap bmp;
//加载左边界位图
bmp.LoadBitmap(DB_BK_2_LEFT);
BITMAP so_bmp;
bmp.GetBitmap(&so_bmp);
int nBmpWidth, nbmpHeight;
nBmpWidth = so_bmp.bmWidth;
nbmpHeight = so_bmp.bmHeight;
CDC memDC;
memDC.CreateCompatibleDC(pDC);
memDC.SelectObject(&bmp);
pDC->StretchBlt(0,nTitleHeight,nborder,wndRC.Height()-nTitleHeight,&memDC,0,0,nBmpWidth,
nbmpHeight,SRCCOPY);
bmp.DeleteObject();
//加载右边界位图
bmp.LoadBitmap(DB_BK_2_RIGHT);
bmp.GetBitmap(&so_bmp);
nBmpWidth = so_bmp.bmWidth;
nbmpHeight = so_bmp.bmHeight;
memDC.SelectObject(&bmp);
pDC->StretchBlt(wndRC.Width()-nborder,nTitleHeight,nborder,wndRC.Height()-nTitleHeight,&memDC,0,0,nBmpWidth,
nbmpHeight,SRCCOPY);
bmp.DeleteObject();
//加载底边位图
bmp.LoadBitmap(DB_BK_2_BOTTOM);
bmp.GetBitmap(&so_bmp);
nBmpWidth = so_bmp.bmWidth;
nbmpHeight = so_bmp.bmHeight;
memDC.SelectObject(&bmp);
pDC->StretchBlt(nborder,wndRC.Height()-nborder,wndRC.Width()-2*nborder,nborder,&memDC,0,0,nBmpWidth,
nbmpHeight,SRCCOPY);
bmp.DeleteObject();
//加载标题栏位图
bmp.LoadBitmap(DB_BK_2_TITLE);
bmp.GetBitmap(&so_bmp);
nBmpWidth = so_bmp.bmWidth;
nbmpHeight = so_bmp.bmHeight;
memDC.SelectObject(&bmp);
pDC->StretchBlt(0,0,wndRC.Width(),nTitleHeight+nborder,&memDC,0,0,nBmpWidth,
nbmpHeight,SRCCOPY);
bmp.DeleteObject();
memDC.DeleteDC();
}
[其他解释]
學習了、///
