Thank you for the question.
Please refer to the attached sample project. It demonstrates how to achieve the desired behavior where the color of the splitter is changed when the user mouse hover it.
Please note that DockingManager is an obsolete control and it has already been removed from our ToolBox. Our current CAB support does not include the new RadDock control, but once we update it, I would suggest that you update your application accordingly. RadDock has much more features, wrapped into a convenient and intuitive API, than the old DockingManager control. In addition, the new RadDock control performs better and it is supported by the new Visual Style Builder
. For additional information about RadDock, please refer to this article
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