>>I think the main problem is that the ObjectDataProvider must be in Windows.Resources. Something like this:

<Window x:Class="WpfApplication1.MainWindow"
>>        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
>>        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
>>        xmlns:local ="clr-namespace:WpfApplication1"
>>        xmlns:sys="clr-namespace:System;assembly=mscorlib"
>>        Title="MainWindow" Height="350" Width="525">
>><Window.Resources>
>>    <ObjectDataProvider x:Key="rates"
>>                    MethodName="GetValues" 
>>                    ObjectType="{x:Type sys:Enum}">
>>      <ObjectDataProvider.MethodParameters>
>>        <x:Type TypeName="local:RateType" />
>>      </ObjectDataProvider.MethodParameters>
>>    </ObjectDataProvider>
>>  </Window.Resources>
>><ComboBox ItemsSource="{Binding Source={StaticResource rates}}"></ComboBox>  
>></Window>

I just tried this with RateType defined in the same window so you'll need to adjust.
>>
>>UPDATE: Should have said " with RateType defined in the same namespace as the window"
>>
>>HTH,
>>Viv
>
>Thanks, one step forward :)
>
>I've adjusted the code like this:
>
>

    <Window.Resources>
>        <ObjectDataProvider x:Key="rateTypes"
>                    MethodName="GetValues" 
>                    ObjectType="{x:Type sys:Enum}">
>            <ObjectDataProvider.MethodParameters>
>                <x:Type TypeName="SamaanSystems_IBC_Business:RateType" />
>            </ObjectDataProvider.MethodParameters>
>        </ObjectDataProvider>
>    </Window.Resources>

>
>But I get an error: Type 'SamaanSystems_IBC_Business:RateType' was not found.
>
>I have this defined:
>
>

xmlns:SamaanSystems_IBC_Business="clr-namespace:SamaanSystems.IBC.Business;assembly=SamaanSystems.IBC.Business"

>
>and this defined:
>
>

namespace SamaanSystems.IBC.Business
>{
>	/// <summary>
>	/// Summary description for Rate.
>	/// </summary>
>	public partial class Rate
>	{
>         public enum RateType : int
>         {
>             Standard = 1,
>             Mail = 2,
>             ZipX = 3
>         }
>       }
>}

>
>Do you see what's causing this?
>
>Learning new stuff can be veeeeery frustrating at times :(

I don't think you can nest RateType inside the partial class. Any reason why it has to be that way ?