I can't use FindWindowEx() to find control.

I want to open Microsoft Security Essential program and click Scan now button with VC . I can find window but Can't find control. This is my code when I run this code it show Control not found . I try to test this code with click Browse button in Run program it work but when I try to use with Microsoft Security Essential it not found control. I don't know why maybe this control is in Tab . How to use FindWindowEx() click Scan now button in Microsoft Security Essential ?

Code:

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int run_ms(){       

        ShellExecute(NULL, L"open", L"C:/Program Files/Microsoft Security Client/msseces.exe", NULL, NULL, SW_SHOWNORMAL);

        HWND w;
        w=FindWindow(NULL, L"Microsoft Security Essentials");

                if(w==NULL)
                                MessageBox(NULL,L"Not found",L"",MB_OK);

                else{
                                HWND cb;
                                cb = FindWindowEx(w,NULL,NULL,_T("&Scan now"));               

                        if(cb!=NULL)
                        {
                                SendMessage(cb,WM_LBUTTONDOWN, NULL,NULL);
                                SendMessage(cb,WM_LBUTTONUP, NULL,NULL);
                        }
                        else
                                MessageBox(NULL,L"Control not found",L"",MB_OK);
                }

                        return 0;
}

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Start from learning Microsoft Security Essential window structure with Spy++.

I use Spy++ with button in Microsoft Security Essential it show like this

Quote:

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Caption : &Scan now
Class : ALT:BUTTON

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I use FindWindowEx() like this cb = FindWindowEx(w,NULL,NULL,_T("&Scan now")); but it not found Control.

Quote:

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Originally Posted by mmc01

I use Spy++ with button in Microsoft Security Essential it show like this

I use FindWindowEx() like this cb = FindWindowEx(w,NULL,NULL,_T("&Scan now")); but it not found Control.

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And why you're so sure you're able to do that? Did you follow the advice Alex F gave you?