How do I validate an elementhost in a windows form application

I need to validate that there is a information in an elementhost that I have put in a windows form application.

I can see what I want when I drill down inside the child and go to text but I can't point to it in this code.  Here is the code I am using.  

Any suggestions would be much appreciated!!

Thanks.


  ElseIf control.GetType.ToString = "System.Windows.Forms.Integration.ElementHost" Then
            Dim thisString As System.Windows.Forms.Integration.ElementHost = CType(control, Integration.ElementHost)
            If thisString.Child Is "" Then
                MessageBox.Show(thisString.Tag.ToString & " is a required field.", Title)
                thisString.Select()
                Return False
            Else
                Return True
            End If