Since 19.2, the "itemTemplate" option of dxButtonGroup will be an alias for the "template" option of each inner button.
dxButtonGroup is the collection widget, but it operates with a collection of other widgets - dxButtons.
Before this change, when redefining the "itemTemplate" option, a user had to create all button markup on their own.
After this change, it will be easier to make fragmentary customizations of the buttons included in dxButtonGroup.
We believe that this is a more frequent case than the case when a user needs to customize full button markup.
This change will be applied to all supported approaches (jQuery, Angular, React, MVC, Vue).