Hi M,

Glad to hear that the problem of hiding cursor on the WebBrowser is solved

As for finding a specific child window, I do more reading and find that the
Win32 function EnumChildWindows is more efficient. The EnumChildWindows
function enumerates the child windows that belong to the specified parent
window and pass each child window's handle to an application-defined
callback function. If a child window has its own child windows,
EnumChildWindows enumerates those windows as well. EnumChildWindows
continues until the last child window is enumerated or the callback
function return false.

In the application-defined callback function, we need to determine whether
the child window associated with the handle is the window we look for. To
do this, we could use Win32 function GetClassName to retrieve the name of
the class to which the specified window belongs and use Win32 function
GetWindowText to get text of the specified window's title bar.

The following is a sample. It requires that you add a WebBrowser and a
Button on the form.

Imports System.Runtime.InteropServices

Public Class Form1

   Declare Auto Function EnumChildWindows Lib "user32.dll" (ByVal
hWndParent As IntPtr, ByVal lpEnumFunc As MyDelegate, ByVal lParam As
WindowParam) As Boolean
   Declare Auto Function GetClassName Lib "user32.dll" (ByVal hWnd As
IntPtr, ByVal lpClassName As System.Text.StringBuilder, ByVal nMaxCount As
Integer) As Integer
   Declare Auto Function GetWindowText Lib "user32.dll" (ByVal hWnd As
IntPtr, ByVal lpString As System.Text.StringBuilder, ByVal nMaxCount As
Integer) As Integer

   Delegate Function MyDelegate(ByVal hwndChild As IntPtr, ByVal lParam As
WindowParam) As Boolean
   Private expectedChild As IntPtr

   Class WindowParam
       Private _className As String
       Private _windowName As String
       Public Property ClassName() As String
           Get
               Return _className
           End Get
           Set(ByVal value As String)
               _className = value
           End Set
       End Property
       Public Property WindowName() As String
           Get
               Return _windowName
           End Get
           Set(ByVal value As String)
               _windowName = value
           End Set
       End Property
       Public Sub New(ByVal cn As String, ByVal wn As String)
           _className = cn
           _windowName = wn
       End Sub
   End Class

   Private Function EnumChildProc(ByVal hwndChild As IntPtr, ByVal lParam
As WindowParam) As Boolean
       Dim className As New System.Text.StringBuilder(255)
       GetClassName(hwndChild, className, 255)

       Dim windowName As New System.Text.StringBuilder(255)
       GetWindowText(hwndChild, windowName, 255)

       If (className.ToString().Equals(lParam.ClassName) And
windowName.ToString().Equals(lParam.WindowName)) Then
           expectedChild = hwndChild
           Return False
       Else
           Return True
       End If
   End Function

   Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
       Me.WebBrowser1.Url = New Uri(Application.StartupPath + "\pdf1.pdf")
   End Sub

   Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
       Dim result As Boolean
       result = EnumChildWindows(Me.WebBrowser1.Handle, New
MyDelegate(AddressOf EnumChildProc), New WindowParam("AVL_AVView",
"AVPageView"))
       If (result = False) Then
           MessageBox.Show(Convert.ToString(expectedChild.ToInt32(), 16))
       End If
   End Sub
End Class

Hope this helps.
If you have anything unclear, please feel free to let me know.

Sincerely,
Linda Liu
Microsoft Online Community Support