Setting Focus On A Control

I have a form with a tabcontrol.  Within the 3rd tabpage of the 1st tabcontrol is another tabcontrol.  On the 1st tabpage of the 2nd tabcontrol is a set of controls (datagridview, combobox, textbox, etc.).  When I click on the 3rd tabpage of the 1st tabcontrol the "_Enter" event for the 3rd tabpage of the 1st tabcontrol is fired and the datagridview is loaded.  Right after that I want to set the focus to the combobox that is also on that tabpage.  The combobox.focus does not seem to work.  Solution?

Private Sub tbpgTransactions_Enter(ByVal sender As Object, ByVal e As _ 
& System.EventArgs) Handles tbpgTransactions.Enter
        SqlDataAdapter1.SelectCommand.CommandText = "SELECT * FROM HM_Transactions"
        SqlDataAdapter1.Fill(HmsDataSet1.HM_Transactions)
        cbMntTrnAccountNumber.SelectedIndex = 27
        cbMntTrnAccountNumber.Focus()
    End Sub

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