I want to send a "Ctrl + Tab" message from one application to a dialog box in another application. I am using this with InstallShield to perform an automated setup of an application. The application has a dialog box with a SysTabControl32 in it. I need to be able to select one of the tabs behind the top level one showing in the dialog box. I have tried using SendMessage with the WM_KEYDOWN message to no avail. Any other suggestions?