A VERY important feature. It will come in very handy in vertical gallery controls where the fields are aligned horizontally (another, and even MORE important a feature--essentially a sub-grid--rather than always having to modify the out-of-the box vertical gallery control).
Equally a whole host of the controls need a bit of updating so they can be better formatted and same features in all. The fact you can apply radius to text input boxes but not labels. The calendar colour, etc
Be good to to be able to enter grid tables for layout.
You can now get horizontal radios by setting the Layout property to Layout.Horizontal.