In XAML <ToolBarTray /> element is used to create TollBarTray control in WPF. We can use ToolBarTray control to position Toolbar into ToolBarTray control. Use the Band and BandIndex property to position the toolbar into toolbartray. Band property indicates the position in which the toolbar is placed within its parent toolbartray and BandIndex property indicates the order in which toolbar is placed within its band. We can specify when an item on tool bar is placed on the overflow panel by setting the ToolBar.OverFlowMode attached property to OverflowMode.Always, OverflowMode.Never, or OverflowMode.AsNeeded.
Following XAML code snippet represent use of toolbar controls in WPF