>Hi,
>
>I have the following enum defined:
>
>

        public enum RateType : int
>        {
>            Standard = 1,
>            Mail = 2,
>            ZipX = 3
>        }

>
>I need to let the user pick form a combo whether the rate is one of these (standard, Mail or ZipX) and store the int value back to the database.
>
>How would I define this in xaml?
>
>Something like this:
>
>

<ComboBox Grid.Column="1" Grid.Row="1" Margin="0" Name="cboRateTypes" SelectedValue="{Binding rat_type, Mode=Default}" VerticalAlignment="Center" ItemsSource="{Binding}">
>                                    <ComboBoxItem Content="Standard" />
>                                    <ComboBoxItem Content="Mail" />
>                                    <ComboBoxItem Content="ZipX" />
>                                </ComboBox>

MarkupExtension is one way to go. The first answer here gives an example which would work with any enum:
http://stackoverflow.com/questions/58743/databinding-an-enum-property-to-a-combobox-in-wpf

Or using ObjectDataProvider:
http://www.codeproject.com/Articles/29495/Binding-and-Using-Friendly-Enums-in-WPF

Both may look more complex than what you are looking for but will be useful again and again....