This is a complex issue due to the integration of these two controls TabControl and HtmlPlaceHolder. Furthermore the KeppingContent in memory and preserving the SL Content are independend features too complex on their own. This is just to say that it is hard to say whether exactly the issue is in the HTMLPlaceholder or in the RadTabControl or whether it is a limitation in the SL Framework. We can only say that we are aware of this issue and it is logged previously in our PITS
During the years, RadTabControl is the control from these two that has evolved a lot. But this is just a shoot in the dark. We need a much deeper investigation to perform to answer precisely.
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