[Help] Folder dialog close event?

I currently have a folder dialog that allows you to choose a folder but I need to somehow make my app do something if you close the dialog pre-maturely or at least, disable the X button... Any ideas?

[php] Private Sub doFolderSelect()
Try
Dim FolderBrowserDialog1 As New FolderBrowserDialog

With FolderBrowserDialog1
****otFolder = Environment.SpecialFolder.Desktop
Dim folder As String = "C:\"
.SelectedPath = folder
.Description = "Select the folder:"
If .ShowDialog = DialogResult.OK Then
If IO.File.Exists(.SelectedPath) Then
MsgBox("Folder exists!")
End If
End If
End With
Catch ex As Exception
End Try
End Sub[/php]

Of course that is not my real code but that's pretty much what it is..