Hello Rene,
We already answered this question in your support ticket. However, I will post the same answer here so others from the community can see it.
By default the
RadTabControl only keeps the content for its selected tab. After the selection is changed the
content of the last active
RadTabItem is unloaded and that is why the content does not keep its state. However, you can use the
RadTabControl.IsContentPreserved property which loads the
RadTabItems and does not unload them after the selection is changed. For more information about the
IsContentPreserved property you could take a look at
this article.
Regards,
Pavel R. Pavlov
the Telerik team