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    <p>Here's what I did* based on Brian's links<br> First create a dialog resource with the properties:</p> <ul> <li>border <strong>FALSE</strong></li> <li>3D look <strong>FALSE</strong></li> <li>client edge <strong>FALSE</strong></li> <li>Popup style</li> <li>static edge <strong>FALSE</strong></li> <li>Transparent <strong>TRUE</strong></li> <li>Title bar <strong>FALSE</strong> </li> </ul> <p>and you should end up with a dialog window with no frame or anything, just a grey box. override the Create function to look like this: </p> <pre><code>BOOL LightBoxDlg::Create(UINT nIDTemplate, CWnd* pParentWnd) { if(!CDialog::Create(nIDTemplate, pParentWnd)) return false; RECT rect; RECT size; GetParent()-&gt;GetWindowRect(&amp;rect); size.top = 0; size.left = 0; size.right = rect.right - rect.left; size.bottom = rect.bottom - rect.top; SetWindowPos(m_pParentWnd,rect.left,rect.top,size.right,size.bottom,NULL); HWND hWnd=m_hWnd; SetWindowLong (hWnd , GWL_EXSTYLE ,GetWindowLong (hWnd , GWL_EXSTYLE ) | WS_EX_LAYERED ) ; typedef DWORD (WINAPI *PSLWA)(HWND, DWORD, BYTE, DWORD); PSLWA pSetLayeredWindowAttributes; HMODULE hDLL = LoadLibrary (_T("user32")); pSetLayeredWindowAttributes = (PSLWA) GetProcAddress(hDLL,"SetLayeredWindowAttributes"); if (pSetLayeredWindowAttributes != NULL) { /* * Second parameter RGB(255,255,255) sets the colorkey * to white LWA_COLORKEY flag indicates that color key * is valid LWA_ALPHA indicates that ALphablend parameter * is valid - here 100 is used */ pSetLayeredWindowAttributes (hWnd, RGB(255,255,255), 100, LWA_COLORKEY|LWA_ALPHA); } return true; } </code></pre> <p>then create a small black bitmap in an image editor (say 48x48) and import it as a bitmap resource (in this example IDB_BITMAP1)<br> override the WM_ERASEBKGND message with:</p> <pre><code>BOOL LightBoxDlg::OnEraseBkgnd(CDC* pDC) { BOOL bRet = CDialog::OnEraseBkgnd(pDC); RECT rect; RECT size; m_pParentWnd-&gt;GetWindowRect(&amp;rect); size.top = 0; size.left = 0; size.right = rect.right - rect.left; size.bottom = rect.bottom - rect.top; CBitmap cbmp; cbmp.LoadBitmapW(IDB_BITMAP1); BITMAP bmp; cbmp.GetBitmap(&amp;bmp); CDC memDc; memDc.CreateCompatibleDC(pDC); memDc.SelectObject(&amp;cbmp); pDC-&gt;StretchBlt(0,0,size.right,size.bottom,&amp;memDc,0,0,bmp.bmWidth,bmp.bmHeight,SRCCOPY); return bRet; } </code></pre> <p>Instantiate it in the DoModal of the desired dialog, Create it like a Modal Dialog i.e. on the stack(or heap if desired), call it's Create manually, show it then create your actual modal dialog over the top of it: </p> <pre><code>INT_PTR CAboutDlg::DoModal() { LightBoxDlg Dlg(m_pParentWnd);//make sure to pass in the parent of the new dialog Dlg.Create(LightBoxDlg::IDD); Dlg.ShowWindow(SW_SHOW); BOOL ret = CDialog::DoModal(); Dlg.ShowWindow(SW_HIDE); return ret; } </code></pre> <p>and this results in something <strong>exactly</strong> like my mock up above </p> <p>*there are still places for improvment, like doing it without making a dialog box to begin with and some other general tidyups.</p>
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