Thank you for your reply.
We are glad you have found the Upgrade wizard.
As far as design time is concerned, if you are talking about Visual Studio's design surface, indeed it is impossible to reach a control if it is behind another one. If you use Blend, however, just press the Alt key and click on the control that is behind the RadBusyIndicator - this should select it successfully.
I cannot claim that you are not using the RadBusyIndicator correctly because this may be the only way for it to fit your particular need. Still, you may try using it just like ContentControl - i.e. place all the controls inside it - thus you will be able to manipulate them through the design surface in both Blend and Visual Studio.
Hope this explains the matter. Let us know in case you need further assistance.
the Telerik team
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