Para este ejemplo escribimos el siguiente codigo en el evento click del menustrip
Dim frm3 As New Form3
        With frm3
            .MdiParent = Me
            .StartPosition = FormStartPosition.Manual
            Dim left As Integer = 0
            Dim top As Integer = 140
            .Location = New Point(left, top)
            .Show()
        End With
        Dim frm2 As New Form2
        frm2.StartPosition = FormStartPosition.Manual
        frm2.MdiParent = Me
        frm2.Show()y este codigo es para el evento click del boton del MDIChildForm1:Dim frm3 As Form3 = Nothing
        For Each frm As Form In Me.MdiParent.MdiChildren
            If TypeOf frm Is Form3 Then
                frm3 = DirectCast(frm, Form3)
                frm3.Label1.Text = Me.TextBox1.Text
            End If
        Nextespero les sea de utilidad el codigo =)


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