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This article is obsolete starting with v10.1. Use the built-in feature of the Document Manager component instead: Document Selector
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The built-in Back and Forward Actions allow end-users to navigate between previously invoked Views. These Actions are contained in the DevExpress.ExpressApp.SystemModule.ViewNavigationController. This Controller is not intended for use in applications with MDI strategy, because it collects a history of Views invoked in the application's main Window. In an MDI application, the main Window doesn't have any View; all Views are displayed in child Windows. So, the Back and Forward Actions are always disabled.
This example demonstrates how to create a custom WindowController that contains navigation Actions collecting Views from invoked MDI child forms. For details on this example, refer to the OBSOLETE - How to Add the Back and Forward Buttons to an MDI Application article.