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        public void StartUpButton()
        {
            comboBox = this.commandBar.Controls.Add(Office.MsoControlType.msoControlComboBox, missing, missing, missing, true) as Office.CommandBarComboBox;

            comboBox.AddItem("ComboBoxItem1", 1);
            comboBox.AddItem("ComboBoxItem2", 2);

            comboBox.Caption = "ComboBox";

            comboBox.Tag = "myComboBox";
            
            comboBox.Change += new Microsoft.Office.Core._CommandBarComboBoxEvents_ChangeEventHandler(ComboBox_Change);
        }

        static void ComboBox_Change(Microsoft.Office.Core.CommandBarComboBox ctrl)
        {
            MessageBox.Show("Changed " + ctrl.Text);
        }                    

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if Checkbox1.Checked
  then ShowMessage('Checkbox1 ist aktiviert');
if Checkbox2.Checked
  then Showmessage('Checkbox2 ist aktiviert');
if not Checkbox1.Checked and Checkbox2.Checked
  then Showmessage('Keine Checkbox ist Aktiviert');