Hello Henrique Duarte,
RadBusyIndicator doesn't have suitable event for what you want to achive. However here is a sample code that will do the trick:
this.radBusyIndicator.IsBusy = true;
timer = new DispatcherTimer();
timer.Interval = this.radTransitionControl.Duration;
delegate(object s, EventArgs args)
this.radBusyIndicator.IsBusy = false;
Hope this helps.
All the best,
the Telerik team
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