How to move the focus to a particular field

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VB

HI All,

I have one form consisting of 32 fields in which most of them are mandatory.After
clicking on save button i am adding the field's related name to Collections(List of string) and displaying message box with the names.I want the focus to move to the first control displaying in message box.

I am doing something like this

In button Click

Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click
       Try
           IsValidData()
           If m_InvalidList.Count > 0 Then
               Dim sFields As String = ""
               For iCnt As Int32 = 0 To m_InvalidList.Count - 1
                   sFields &= m_InvalidList(iCnt).ToString & vbCrLf
               Next
               XtraMessageBox.Show(" Please Fill The Following Fields : " & vbCrLf & "--------------------------------------" & vbCrLf & sFields, "Field Validator", MessageBoxButtons.OK)
           Else
               SaveGenLedgerMaster()
           End If

       Catch ex As Exception
           ErrorLog(ex)
       End Try
   End Sub

Private Sub IsValidData()
      Try
          m_InvalidList.Clear()
          If xtbGLName.Text = "" Then m_InvalidList.Add("General Ledger Name")
          If cmbGLSchedule.Text = "" Then m_InvalidList.Add("Schedule name")
          If ccbCompany.Text = "" Then m_InvalidList.Add("Company")
          If ccbSegment.Text = "" Then m_InvalidList.Add("Segment")

      Catch ex As Exception
          ErrorLog(ex)
      End Try
  End Sub

I want to focus the control binded to the first string in the List .How can i do this..is there any way other than this..like adding control to the list instead and set focus...please help me out..