   Win32 ComboBoxEx does not update items
  When I try to change the image of a comboboxex item (Windows XP Pro), it does not get displayed immediately. I have to move another window over it or call hide/show on the comboboxex window to let it show up correctly.// For exampleCOMBOBOXEXITEM item;memset(&item, 0, sizeof(item));   item.mask = CBEIF_OVERLAY | CBEIF_INDENT | CBEIF_IMAGE | CBEIF_TEXT;   item.iItem= 0;   item.pszText   = "some text";   item.iIndent   = 0;   item.iOverlay  = 1;   item.iImage    = 1;SendDlgItemMessage(hwndDlg, 10001, CBEM_SETITEM, 0, (LPARAM)&item);Furthermore, the overlay image is not displayed at all although the image definitely exists in the imagelist. MSDN couldn't help me...Hope you can ;)   
  You probably just need to force the combo box window to repaint itself.  Try using InvalidateRect on the combo box window handle.   ;  Another funny behavior:InvalidateRect(GetDlgItem(hwndDlg, 10001), 0, false)does not affect anything =)InvalidateRect(GetDlgItem(hwndDlg, 10001), 0, true)which means erase background, let's the comboboxex go white ^^ but it won't get repainted until I move something over it or show/hideWhat is going on there??   ;  No other solutions?   ;  That might as well be a fault of the message pump or the window proc.Are you per chance passing a non-NULL HWND into PeekMessage/GetMessage?   ;  Have you tried this?UpdateWindow(hWnd);Works for me :)...or in your case UpdateWindow(hwndDlg);   ;  UpdateWindow(hwndDlg) doesn't work for me.And it's a dialog created by the DialogBoxParam() function, so Windows handles the message queue...I think I'm gonna use an owner-drawn combobox, this actually seems like a bug to me :(   ;  I use the following to create a dialog box (using a resource file)DialogBox(hInstance,MAKEINTRESOURCE(IDD_DIALOG1),NULL,MainDlgProc);I must admit I haven't tried the other way (that you use).Good luck :)   