In our online domes the described control is a custom progress bar but it is possible to customize the way BusyIndicator
looks to achieve the desired look. You can read our online documentation about Styling the RadProgressBar
for more information on how to customize the look of the control.
You can read this
help article that describes the IsIndeterminate
property of the control, and this
help article that describes how the Report Progress Value works.
Hope this is helpful.
the Telerik team