How to change border color of the docking window in WinForms Docking Manager?
Border color
The Docking Manager has the BorderColor Property to set the new Border Color dynamically.
C#
this.dockingManager1.BorderColor = System.Drawing.Color.IndianRed;
VB
Me.dockingManager1.BorderColor = System.Drawing.Color.IndianRed
Reference link: https://help.syncfusion.com/windowsforms/dockingmanager/appearance#customize-border
