对话框颜色设置

给对话框类添加消息响应函数Onpaint()

void Dialog::OnPaint()
{
        CRect rect;
        CPaintDC dc(this);
        GetClientRect(rect);
        dc.FillSolidRect(rect,RGB(122,100,255));  //设置背景,可任意调整

        CDialog::OnPaint();

}