Uri property in a Silverlight 2 UserControl

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In creating a Silverlight 2 UserControl, I had a need to include a Uri parameter, so I added a property. 

 class MyControl : UserControl
{
    ...
    public Uri Source {get;set;}
    ...
}

That compiled and ran just fine but when I tried to set the value via XAML, I got an AG_E_PARSER_BAD_PROPERTY_VALUE error. The property was missing a type converter, a class that converts between a string and the property value. I added a using directive and the attribute to the property specifying to use the built-in UriTypeConverter:

 using System.ComponentModel;

 class MyControl : UserControl
{
    ...
    [TypeConverter(typeof(UriTypeConverter))]
    public Uri Source {get;set;}
    ...
}

That fixed it!