DoubleEditBox and StringValueConverter

I am trying to append units and get custom formatting to work with my DoubleEditBox. To do that, I have tried to implement an IStringValueConverter<double?> to set to the DoubleEditBox so that I can do custom formatting in it.

However, none of my methods are called in my StringValueConverter if I put in the necessary breakpoints.

public class DSVConverter : IStringValueConverter<double?>
{
public DSVConverter()
{

}

#region IStringValueConverter<double> Members

public bool CanConvertFromString(string text)
{
return true;
}

public bool CanConvertToString(double value)
{
return true;
}

public double ConvertFromString(string text)
{
return double.Parse(text);
}

public string ConvertToString(double value)
{
return value.ToString("##.00");
}

#endregion
}

<editors:DoubleEditBox Value="{Binding Height}"
StringValueConverter="{StaticResource dsvConverter}"/>

Could you please help me identify what I am doing wrong? Could you give me a sample on how to make this work?

Thanks in advance

[Modified at 09/08/2011 09:08 AM]