'для каждой кнопки использую такую процедуру HelpAddButton1/HelpAddButton2/HelpAddButton3/...
    Public Sub HelpAddButton2()
        Dim iPanel As Panel
        Dim Width As Integer
        Dim Height As Integer
        Dim Local_X As Integer
        Dim Local_Y As Integer

        Width = 110
        Height = 23
        Local_X = 4 + 200 + 4 + 130 + 4 + 100 + 4
        Local_Y = 4
        iPanel = Me.Controls.Item("Panel1")
        CreateNewButton("Button2", iForm, iPanel, Local_X, Local_Y, Width, Height, "Редактор")
    End Sub

    'Добавляем программно в проект новый Button
    Public Sub CreateNewButton(ByVal iName As String, _
                               ByVal ParentForm0 As Object, _
                               ByVal ParentForm As Object, _
                               ByVal LocationX As Integer, _
                               ByVal LocationY As Integer, _
                               ByVal BWidth As Integer, _
                               ByVal BHeight As Integer, _
                               ByVal iText As String)
        Dim iButton As New Button ' НОВЫЙ элемент Button

        If CreateControlWithName(ParentForm, iName) = False Then
            AddHandler iButton.Click, AddressOf ParentForm0.iButton_Click
            ParentForm.Controls.Add(iButton)

        Else
            iButton = ParentForm.Controls.Item(iName)
        End If

        iButton.Name = iName
        iButton.Location = New System.Drawing.Point(LocationX, LocationY)
        iButton.Size = New System.Drawing.Size(BWidth, BHeight)
        iButton.Text = iText
    End Sub

#Region "События iComboBox"
    'изменяем значения выбранного параметра в iComboBox
    Public Sub iComboBox_SelectedIndexChanged(sender As System.Object, e As System.EventArgs)
        Dim iPanel As Panel 'В моём случае я зачем-то размещаю Panel на Form, а уж потом добавляю на Panel Batton-ы и ComboBox-ы
        iPanel = Me.Controls.Item("Panel1")
        iComboBox = iPanel.Controls.Item(sender.Name)'Таким способом я указываю имя того ComboBox с которым сейчас работаю. Это и было источником ошибки в самом начале.
        iParameter = iComboBox.SelectedIndex
        CreateOneParameterTXTData(iParameter, TXTData, TXTDataList)' Мои подпрограммы
        START(TXTData, ServiseData)'                                                и логика
    End Sub
#End Region

    'Добавляем программно в проект новый ComboBox
    Public Sub CreateNewComboBox(ByVal iName As String, _
                                 ByVal ParentForm0 As Object, _
                                 ByVal ParentForm As Object, _
                                 ByVal LocationX As Integer, _
                                 ByVal LocationY As Integer, _
                                 ByVal CBWidth As Integer, _
                                 ByVal CBHeight As Integer)
        Dim iComboBox As New ComboBox ' НОВЫЙ элемент ComboBox

        If CreateControlWithName(ParentForm, iName) = False Then
            'RemoveHandler iComboBox.SelectedIndexChanged, AddressOf ParentForm0.iComboBox_SelectedIndexChanged
            AddHandler iComboBox.SelectedIndexChanged, AddressOf ParentForm0.iComboBox_SelectedIndexChanged
            ParentForm.Controls.Add(iComboBox)
        Else
            iComboBox = ParentForm.Controls.Item(iName)
        End If
        iComboBox.Name = iName
        iComboBox.Location = New System.Drawing.Point(LocationX, LocationY)
        iComboBox.Size = New System.Drawing.Size(CBWidth, CBHeight)
    End Sub

    'функция определяющая создан ли Control с именем "name" в данном проекте
    Public Function CreateControlWithName(ByVal iForm As Object, ByVal name As String) As Boolean
        Dim sss As String
        Dim i As Integer
        CreateControlWithName = False
        For i = 0 To iForm.Controls.Count - 1
            sss = iForm.Controls(i).Name
            If Trim(name) = Trim(sss) Then
                CreateControlWithName = True
                Exit For
            End If
        Next i
    End Function

Me.iPictureBox.Anchor = (System.Windows.Forms.AnchorStyles.Top Or _
                                     System.Windows.Forms.AnchorStyles.Bottom Or _
                                     System.Windows.Forms.AnchorStyles.Left Or _
                                     System.Windows.Forms.AnchorStyles.Right)

Local_X = 4 + 200 + 4 + 130 + 4 + 100 + 4