the following sample code uses the NavBarControl.DragDropFlags property to modify the control’s drag and drop options. It prohibits dropping items from the same control and allows you to drop items from other NavBarControl.
using DevExpress.XtraNavBar;
// ...
navBarControl1.DragDropFlags &= ~NavBarDragDrop.AllowDrop;
navBarControl1.DragDropFlags |= NavBarDragDrop.AllowOuterDrop;
Imports DevExpress.XtraNavBar
' ...
With NavBarControl1
.DragDropFlags = .DragDropFlags And Not NavBarDragDrop.AllowDrop
.DragDropFlags = .DragDropFlags Or NavBarDragDrop.AllowOuterDrop
End With