CreateProcess and EnumChildWindows()

[Baral]

Hi,
I want to place the cursor(text) in a specific line of a file in the Notepad, when i will click on a button from some other application.
For that i am using CreateProcess();
Then I am getting the window using FindWindow();
Then i am proceesing the child of the Notepad which is of CEdit type...
The problem that i am facing is if i am running as an executable then the cursor is staying at line 1...But if i am executing step wise (F5 key) then the cursor is going to the desired line...
Pls help me...I am in great problem....
Below i am also giving the code....
void CButtonWindow::HandleButton()
{
PROCESS_INFORMATION pi;
STARTUPINFO si;
memset(&si, 0, sizeof(si));
si.cb = sizeof(STARTUPINFO);
si.dwFlags = STARTF_FORCEONFEEDBACK;
BOOL bSuccess = CreateProcess(NULL,"Notepad c:\\a.txt",NULL,NULL,FALSE, NORMAL_PRIORITY_CLASS, NULL,"C:\\", &si,
&pi ); if(bSuccess){
HWND hWnd = ::FindWindow("Notepad","a - Notepad"
if(hWnd)
EnumChildWindows(hWnd, EnumProc, (LPARAM)&pi);
CloseHandle(pi.hThread);
}

BOOL CALLBACK EnumProc(HWND hChild, LPARAM lParam){
PROCESS_INFORMATION* pi = (PROCESS_INFORMATION*)lParam;
int index=SendMessage(hChild,EM_LINEINDEX,5,0); // put the cursor on line 6
SendMessage(hChild,EM_SETSEL,index,index);
return FALSE;
}