I have a combo box as shown in the code below. I would like to display the name of the selection in a message box when I select it. What I am trying is - 

```
<dxb:BarEditItem.EditTemplate>
<DataTemplate>
    <dxe:ComboBoxEdit x:Name="PART_Editor"
                      SelectedIndexChanged="OnSelectedIndexChanged" Name="comboBox">
        <dxe:ComboBoxEdit.Items>
            <system:String>Item1</system:String>
            <system:String>Item2</system:String>
        </dxe:ComboBoxEdit.Items>
    </dxe:ComboBoxEdit>
</DataTemplate>

```

How can I add the code in the backend for getting the selected name inside a message box?