In this case, I believe you will need to use our RadTabControl because it exposes a property which disables the reloading of the content. More information you can find here
. As for #2, we are not aware of such an existing issue. If it is possible, could you please isolate the issue in a small project and send it to us. This way we will be able to assist you better.
All the best,
the Telerik team
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