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From: Uwe Kotyczka <uwe.kotyczka@web.de>
Newsgroups: comp.os.ms-windows.programmer.misc,comp.os.ms-windows.programmer.win32,microsoft.public.vb.winapi
Subject: Re: Finding the inner controls, when having handle of window.
Date: Mon, 21 May 2012 00:50:56 -0700 (PDT)
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Say hWnd is the handle to your dialog box,
then you can iterate through the (direct)
children (controls) by:

for (HWND hChild = GetWindow(hWnd, GW_CHILD); hChild != NULL; hChild =
GetNextWindow(hChild, GW_HWNDNEXT))
{
    // do something with hChild
}

HTH