The data operations are done synchronously on the UI thread. Therefore, when you reset the data descriptors for your RadJumpList, you can be sure that they have completed after the code you are using to reset them. So, in this case, you can use the Busy Indicator in the following way:
> gd =
gd.KeySelector = p => p.ToString()[p.ToString().Length - 1];
As you can see, before calling the code that resets my group descriptors, I start the Busy Indicator. After that, in a Dispatcher, I am resetting the group descriptors and stop the busy indicator at the end.
This works as expected on my side.
I hope this helps.
the Telerik team
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