You received the following error when loading a page with WebDock or WebSplitter at run-time:

The control with ID '' requires a ScriptManager on the page. The ScriptManager must appear before any controls that need it.

If any update panels, such as WebDockTabbedUpdatePanel or WebSplitterUpdatePanel,  are used in WebDock or WebSplitter, you must add a ScriptManager to the page.

The ScriptManager must be added before all other controls.

Please refer to the relevant section in the Microsoft ASP.NET AJAX Documentation for details on ScriptManager.