evc中怎么才能让对话框透明？

[liuyuw]

我在OnCtlColor里写
HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);
static HBRUSH hbr1 =::CreateSolidBrush(RGB(255, 255, 255));//这里不知道些什么
// TODO: Change any attributes of the DC here
if(nCtlColor ==CTLCOLOR_DLG)
{
pDC->SetBkMode( TRANSPARENT );
return (HBRUSH)GetStockObject( NULL_BRUSH );

// return hbr1;
}
// TODO: Return a different brush if the default is not desired
return hbr;
但是怎么控制画刷hbr1呢？我试过NULL_BRUSH，也没什么用。。。到底应该怎么写啊？

[wwch99]

hollow_brush ??