The following sample code adjusts drag & drop options of the first group within the control. It enables dragging of this group’s links and disables dropping links from other controls into this group. The NavBarGroup.DragDropFlags property is used for this purpose.
using DevExpress.XtraNavBar;
// ...
navBarControl1.Groups[0].DragDropFlags &= ~NavBarDragDrop.AllowOuterDrop;
navBarControl1.Groups[0].DragDropFlags |= NavBarDragDrop.AllowDrag;
Imports DevExpress.XtraNavBar
'...
With NavBarControl1.Groups(0)
.DragDropFlags = .DragDropFlags And Not NavBarDragDrop.AllowOuterDrop
.DragDropFlags = .DragDropFlags Or NavBarDragDrop.AllowDrag
End With