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# How to activate the child window on trying to re-add the same child in WPF DockingManager?

As per implementation of [WPF DockingManager](https://www.syncfusion.com/wpf-controls/docking), you cannot add the same element to the DockingManager which is already exist in DockingManager children collection. While adding same child element to the DockingManager, you can activate that element in DockingManager.
As per implementation of [WPF DockingManager](https://www.syncfusion.com/wpf-controls/docking), you cannot add the same element to the DockingManager which is already exist in DockingManager children collection. While adding same child element to the DockingManager, you can activate that element in DockingManager.

KB article - [How to activate the child window on trying to re-add the same child in WPF DockingManager?](https://www.syncfusion.com/kb/8791/how-to-activate-the-child-window-on-trying-to-re-add-the-same-child-in-wpf-dockingmanager)