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Here is the correct Source to simulate an OnClick-Event on every Control in .NET Compact Framework.
[DllImport("coredll")]
private static extern void SendMessage(IntPtr hWnd, int msg, int wparam, int lparam);
const int WM_LBUTTONDOWN = 0x201;
const int WM_LBUTTONUP = 0x202;
public void PerformClick(System.Windows.Forms.Control control)
{
SendMessage(control.Handle, WM_LBUTTONDOWN, 0, 0);
control.Update();
System.Threading.Thread.Sleep(100);
SendMessage(control.Handle, WM_LBUTTONUP, 0, 0);
}