Is it possible to create a computed column in a Visual Studio database project?

Is it possible to create a computed column in a Visual Studio 2012 Database Project? There is a property called 'Computed column specification -> formula' but it is greyed out and it is not possible to enter a value in it.

Edit The computed column is also greyed out in VS 2013

You can add a computed column in the T-SQL pane. For example (field FullName below):

CREATE TABLE [dbo].[Person] (
    [FirstName] VARCHAR(50) NOT NULL,
    [LastName] VARCHAR(50) NOT NULL,
    [FullName] AS ([FirstName] + ' ' + [LastName])
);

Once the column is defined in T-SQL, the "Formula" option in the properties will become editable. An option for "Is Persisted" will also appear.