Hi Mark,
Thanks for your interest in Syncfusion products.
Vertical scrollbar will be automatically added to the XPTaskBar,
But The horizontal scrollbar appears on setting the VerticalLayout property to 'True' and ColWidthOnHorizontalLayout property to large values.
this.xpTaskBar1.VerticalLayout = True;
this.xpTaskBar1.ColWidthOnHorizontalAlignment = 300;
Refer the sample in the following link which demonstrates the above.
http://www.syncfusion.com/uploads/redirect.aspx?&team=support&file=Taskbar-1816204238.zipPlease let us know if you have any queries.
Regards
Vallarasu S.