The stacked data bar control doesn't support animations out of the box. However, you can achieve your requirement by writing some custom code. For example, when you set a new value, you can start a DisptacherTimer and update the value with smaller step until it gets to the newly set value. This way it will look like the value is animated smoothly. Check this approach in the attached project.
Additionally, you can consider using RadProgressBar
. This way you will need to manage only one value, instead of one for each bar.
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