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In the current version of RadDocking persistence of the focused elements in each RadPane instance is not available as a built-in feature. If such persistence is required by the application in which the RadDocking control is used you will need to add custom implementation to handle the scenario. A good starting point could be to use the ActivePaneChanged
event of the control. That event is triggered each time a new pane is made active (for example: a control in its content is focused). By using that event you can add implementation which will store the element which should be focused when a specific RadPane is made active.
I created a basic sample project which illustrates the described approach. Note that there are scenario which cannot be handled easily and are noted in the project. Hope it is helpful.
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