cclientdc dc(getdlgitem(idc_vw_frame));
dc.setbkcolor(rgb(0,0,0));
crect rc;
getdlgitem(idc_vw_frame)->getclientrect(rc);
//clienttoscreen(rc);
dc.fillrect(rc, cbrush::fromhandle((hbrush)getstockobject(black_brush)));
getdlgitem(idc_vw_frame)->invalidate();
}
cdialog::onpaint();
}
}