get the control in window

[revacdm20635]

hi,

I have to access the controls inside a window.

I found that window using FindWindow.

In my window there is two button.

How can i get the control of that button, So that i have to click that button?

My code is
' declaration
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As System.IntPtr

' code

Dim nWnd As IntPtr
Dim ceroIntPtr As New IntPtr(0)
Dim Wnd_name As String

Wnd_name = "Microsoft Internet Explorer"
nWnd = FindWindow(Nothing, Wnd_name)
MsgBox(nWnd.ToString())
'show the info
If nWnd.Equals(ceroIntPtr) Then
MsgBox("App Not Running")
Else
MsgBox("App Running")
Application.DoEvents()
SendKeys.Send("{ENTER}")
End If

here i get the error in SendKeys.Send("{Enter"}").

How can i access the button inside this window?

Plz help me with some code

Thanks in advance and urgent plz...