Using a dock panel's ASPxDockPanel.ForbiddenZones property, you can specify disallowed zones for the panel - the zones to which the panel cannot be docked. To learn more about forbidden zones, follow the Forbidden Zones topic.
You can respond to panel dragging and docking using the corresponding panel events. Additionally you can respond to closing, showing and resizing of a panel using dock manager events. To learn more, see the Common Docking Events topic.
Reasons for a panel not docking
In the following cases, a panel does not dock to a zone. You can set the panel's owner zone programmatically, but it actually stays in a floating state: