In the current version of RadControls when changing the theme of the controls at runtime it is not possible to show for example RadBusyIndicator as the UI thread is undergoing heavy operations and is frozen. Like any UI control the RadBusyIndicator control is rendered in the UI and if that thread is frozen the control will not show.
From our tests we noticed that changing the themes at runtime with the described in this
article approach results in less them a second duration. If that behavior is not suitable for you, you could try to implement a custom implementation that will open a Popup or a Window above the controls which theme is being changed that shows a message which notifies the user that the theme has been changed. With such approach it is possible to achieve a more smooth transition. Hope this is helpful.
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