How can I get a property value without instantiation when the source is obfuscated?

I have a class with a static property whose value I would like to retrieve without creating an instance of the object:

public partial class CustomDialog : CustomDialogBaseDevice, ICustomDialog
{
    public static new string TypeId
    {
        get
        {
            return "Type1234";
        }
    }
}

I have managed to succeed using the following code:

PropertyInfo prop = t.GetProperty("TypeId");
object propValue = prop.GetValue(null, null);
string typeID = propValue.ToString();

This actually works great...until I obfuscate the DLL containing "CustomDialog". It still finds the property but fails when trying to get the value. I've tried a number of things including using a constant instead of a property and trying dozens of combinations of ObfuscationAttributes to try to exclude the property from obfuscation. So far, the only thing that works is to leave the entire DLL un-obfuscated.

Does anyone know a way to do this while still obfuscating the DLL?