Server Management Studio Crashes On Create Index

Hi

I'm trying to use a udt in a table creation, and everything works as expected, right until the moment where I rightclick on [Indexes] to create a new index.

Then I get this error:

TITLE: Microsoft SQL Server Management Studio
------------------------------
Cannot show requested dialog.
------------------------------
ADDITIONAL INFORMATION:
Cannot show requested dialog. (SqlMgmt)
------------------------------
Object reference not set to an instance of an object. (SqlManagerUI)
------------------------------
BUTTONS:
OK
------------------------------


This is the script I use to create the table:


exec sp_executeSql N'CREATE SCHEMA [TestSchema] AUTHORIZATION [dbo]'

GO

CREATE TYPE [TestSchema].[type_TestType]

FROM uniqueidentifier ;

GO

Create table [TestSchema].[Periode3]

(

Periode3_UID uniqueidentifier NOT NULL ROWGUIDCOL,

rowVersion timestamp NULL,

owner uniqueidentifier not null,

validFrom datetime

NOT NULL CONSTRAINT

DF_Periode_modified3 DEFAULT getdate()

);

Alter table [TestSchema].[Periode3]

add PeriodeType [TestSchema].[type_TestType];

now if I replace the 2 last lines with:


Alter table [TestSchema].[Periode3]

add PeriodeType uniqueidentifier;


everything works as expected.

Where did I go wrong ?

regards
Jens Chr