How to hide caption lines in DockingManager?

Caption lines which is displayed in Metro style can be hidden by disabling the ShowMetroCaptionDottedLines property.

//To hide the caption lines in Metro style

this.dockingManager1.ShowMetroCaptionDottedLines = false;
'To hide the caption lines in Metro style

Me.dockingManager1.ShowMetroCaptionDottedLines = false