Small MDI / Function question

[JohnGH]

Hi,

I having some trouble creating/using functions.
What I thought I could do:

'frmMain MDI Parent
    Private Sub mnuFileNew_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles mnuFileNew.Click
        Dim frmDoc As New frmDocument()
        frmDoc.MdiParent = Me
        frmDoc.Show()
    End Sub
 
    Private Sub mnuFileSave_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles mnuFileSave.Click
        Dim activeChild As Form = Me.ActiveMdiChild
 
        If (Not activeChild Is Nothing) Then
           activeChild.MySaveFunction
        End If
    End Sub
 
'frmDocument
    Public Function MySaveFunction()
        rtfbox.savefile("d:\test.txt")
    End Function

But then it keeps saying that MySaveFunction is not a member of 'System.Windows.Forms'.
What should I do???

John