In this example we are adding a clear button to the "Date Picker" items. You can choose the side the clear icon appears on using the "Orientation" attribute.
Change the Icon
You also have the ability to change the icon and optionally define your own custom icon in the "Icon" attribute e.g.
Icon or Text?
Using the "Button Template" setting you have the ability to show an Icon, an Icon with Text, or Text only e.g.