Win32 API SendMessage not working properly

[Mekinnik]

I can not figure out why my send messages will only work when debugging. When I launch from the .exe file it appears that they are not firing. The code is just suppose to click a button on en external application.

private void TransferBuild (object sender, EventArgs e)  //Button Click Event
{

string sync = @"C:\USCG_IMS\SyncMgr.exe";

if (File.Exists(sync))
{

this.Hide();
ActiveSync.FileName = sync;
ActiveSync.CreateNoWindow = false;
ActiveSync.UseShellExecute = false;

SyncRun.StartInfo = ActiveSync;
SyncRun.EnableRaisingEvents = true;
SyncRun.Exited += new EventHandler (SyncRun_Exited);
SyncRun.Start();

// Initiate the off-load process by auto-clicking the 'OK' button
Process[] processes = Process.GetProcessByName ("SYNCMGR");
foreach (Process p in processes)
{

IntPtr hWnd = FindWind(p.MainWindowHandle, null);
IntPtr hWndChild = FindWindowEx (hWnd, IntPtr.Zero, null, "Sync Mgr");
IntPtr ButtonHandle = FindWindEx (hWndChild, IntPtr.Zero, "Button", null);

SendMessage (ButtonHandle, BN_CLICK, WM_LBUTTONDOWN, IntPtr.Zero);
SendNessage (ButtonHandle, BN_CLICK, WM_LBUTTONUP, IntPtr.Zero);
}
}
}

[Arjay]

Instead of using SendMessage, use UIAutomation to automate an external app.

[Mekinnik]

I have never used UIAutomation. Can you give me some pointers or example of how to accomplish the task I posted?

Thank you,

mekinnik

[Arjay]

Using UIAutomation Automated Testing