Is it possible to access delegate methods across classes in VB.NET

I would like to know how to make I the following conditions work.  I'm trying to call a delegate function from across different instances of classes.  Its not working for me and would love some help.  The whole invoke area does not seem to be working as for some reason FrmClass is not calling its instance name.  

1. I have two classes FrmClass and OtherClass.

2. FrmClass is a standard windows application form class that spawns X number of instances of OtherClass.  Each instance of OtherClass creates and starts a thread.

3. OtherClass declares the delegate:
    Delegate Function LockDocIdHandler(ByVal ThreadIndex As Integer, ByVal DocId As Integer) As Boolean

4. OtherClass also contains the function:
    Public Function LockDocId(ByVal DocId As Integer) As Boolean
        'A copy of this method runs on each Thread....
        Return CType(FrmClass.Invoke(New LockDocIdHandler(AddressOf FrmClass.LockDocIdMethod), New Object() {CInt(System.Threading.Thread.CurrentThread.Name), DocId}), Boolean)
    End Function

5.  The FrmClass contains the delegate method:
    Public Function LockDocIdMethod(ByVal ThreadIndex As Integer, ByVal DocId As Integer) As Boolean
        'Thie method runs on the Form's Thread....
        For intX As Integer = 0 To (_LockArray.Length - 1)
            If _LockArray(intX) = DocId Then
                Return False
                Exit Function   'This Statement is pointless, but it is included to ensure anyone reading this code knows this Function is going to be exited....
            End If
        Next intX
        _LockArray(ThreadIndex) = DocId
        Return True
    End Function

6. I call the function inside OtherClass:
If LockDocID(integerX)  Then
End If

Any help is appreciated, thanks