Hello Shmuel Tal,
In fact, in the Expression Dark theme, the style for the busy indicator is a circle. You can set its progress value from 0 to 100 and set the IsIndeterminate to false. If you want to display the value of the progress, you would have to edit the theme and use a TextBlock, bound to the ProgressValue property in the center.
Kind regards,
Alex Fidanov
the Telerik team
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